Sushibog is wrtten by researchers of Sushi University

Why doesn’t rice stick to the sushi chef’s hands?

A photo of shaping nigiri sushi — Sushi chef is making nigiri sushi.

One of the pleasures of sitting at a sushi counter is watching the sushi master work his craft.

He holds the topping between the index finger and thumb of his left hand while simultaneously grabbing the shari (vinegared rice) with his left hand. He gently squeezes the shari and then moves the topping from his left hand to the top of that shari in a fluid motion. This entire process of shaping the shari to the finished piece of sushi takes less than six seconds. Every movement is precise and purposeful.

However, no matter how many pieces the chef makes one after another, you’ll never see a grain of rice stick to his hands. If you or I were to make even one piece of sushi, our hands would be covered in rice. So why doesn’t it happen to them? Their hands don’t look oiled. Perhaps sushi chefs have especially smooth or slick hands compared to us average Joes?

Of course not. This is actually thanks to the vinegar.

The chefs keep a bowl of vinegar close by, which they constantly use to wet their hands. If the sushi chef’s hands are dry, the rice grains tend to stick to them, so the rice needs to be moistened just enough.

This is called “Tezu” or vinegared water, which both disinfects the hands and cools their palms. When the vinegar evaporates, it takes the heat from the hands with it.

Normally hands reach temperatures of 33-34 degrees Celsius (91-93 degrees Fahrenheit), but sushi chefs cool their hands to approximately 30 degrees Celsius (86 F). This transfers the heat from the hands to the shari, keeping it from getting sticky. In other words, not a single grain of rice sticks to their hands.

Also, the stickiness of rice is mainly caused by starch (especially amylopectin) gelatinizing with water and heat, but vinegar contains acetic acid, which acidifies the pH, so under these conditions, the structure of the starch changes slightly, inhibiting the formation of stickiness (the sticky component).

Additionally, vinegared rice becomes sticky if there is too much moisture, and conversely, if there is too little moisture, it becomes dry and difficult to shape. Therefore, the moisture content and temperature are carefully adjusted to achieve the perfect balance.

In short, it’s not magic or special skin — it’s the calculated use of vinegar, moisture, and temperature control that keeps sushi chefs’ hands rice-free.

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Revision date: June 16, 2025

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Why is freshly-caught fish allowed to age?

The most delicious time to eat fish differs depending on if it is served as sashimi, as sushi, or boiled. Fresh does not necessarily mean delicious. For example, Japanese Amberjack should be used in sashimi 3-5 days after being caught, in sushi a week after being caught and it can be used in a stew or boiled once it turns black around the edges. This is because the inosine acid, which is responsible for the umami taste, increases after rigor mortis ends and understanding the timing of the peak in flavor is up to the skill of the sushi chef.

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Revision date: March 12, 2018

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Why does the bill more when ordering sashimi at a prestigious restaurant?

Thicker cuts of fish are used for sashimi than for sushi. Depending on the restaurant, the equivalent of three pieces of sushi may be used in one cut of sashimi. In other words, two pieces of sashimi is the same as six pieces of sushi. At a restaurant where one piece of medium fatty tuna sushi is priced at JPY 1000, simple arithmetic prices medium fatty tuna sashimi at JPY 6000. Just a small order of assorted sashimi often costs more than JPY 10,000. Be careful.

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Revision date: March 5, 2018

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Why are two pieces of nigiri sushi made at once?

Have you ordered Nigiri sushi and been served two pieces on one plate?

A photo of Conveyor belt sushi — One plate has two pieces of nigiri sushi.

This isn’t something that happens at a conveyor belt sushi restaurant. It can happen at a sushi restaurant with a counter.

There are multiple theories as to the reason for this, but the most likely one is as follows.

The reason sushi is served in sets of two pieces is that this practice is left over from long ago (the Edo period), when pieces of sushi were made large, like onigiri, and difficult to eat. At some point (it’s unclear when), these were just cut in half, making two pieces that led to what we see today (there are multiple theories about when this happened).

However nowadays, if you were to eat two pieces of each topping, you won’t be able to enjoy as many different kinds, so customers sitting at the counter are served only one piece at a time. So then why do other restaurants continue to prepare two pieces at once? This may be in order to improve the efficiency of the sushi chef’s work. Also, regular customers may see toppings others are ordering and ask for the same one. This helps reduce the workload of the sushi chef.

But there are also some toppings that are better to eat in pairs.

For example, conger eel tastes completely different when one piece is eaten with salt and the other seasoned with sweet sauce. Serving the part of the eel closer to the head skin-up and the part closer to the tail belly-up also offers different textures; skin-up offers a smooth texture while belly-up offers a fluffy texture. In addition, the head and tail simply taste differently. Since the back and belly of fish like bonito and mackerel have different fat content, it can be better to order two pieces at a time in order to fully experience each of the individual qualities of the fish.

The sushi chefs at your favorite restaurant know your preferences well. Depending on the type of fish, they may serve you two pieces of the back side, which has a more fishy flavor, without saying anything.

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Revision date: May 29, 2025

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Why don’t I notice the fishy smell in sushi restaurants?

Many overseas visitors who are not accustomed to eating fish often find the fishy smell off-putting. This odor is mainly caused by a compound called trimethylamine, which forms when bacteria break down trimethylamine oxide, a substance abundant in fish that contributes to umami flavor. As time passes, ammonia is also generated, further intensifying the odor.

Trimethylamine begins to form after the fish dies. Therefore, the key to minimizing this smell is to process the fish as soon as possible after it is caught. Removing the slimy coating on the skin, as well as any decaying internal organs or blood, also helps reduce odor. It is essential to rinse the fish with water.

After cleaning, the fish is typically lightly salted and refrigerated. After some time, the salt is rinsed off using saltwater with a salinity of about 3%, similar to that of seawater. This step is crucial because rinsing with fresh water would cause the fish to reabsorb moisture through osmosis, making the previous dehydration process ineffective and leaving the fish with a watery texture.

Bacterial growth is further suppressed by refrigeration, which is why sushi toppings are kept cold. Additionally, since trimethylamine is alkaline, it can be neutralized by vinegar, which is acidic. Soaking fish in vinegar not only helps eliminate odor but also reduces surface bacteria.

In short, sushi restaurants take meticulous steps to prevent bacterial growth and eliminate fishy smells, ensuring that customers enjoy fresh, clean-tasting sushi.

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Revision date: June 10, 2025

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Is sushi eaten with your hands? Or should you use chopsticks?

A photo of Edo-period nigiri sushi — This is Edo-period nigiri sushi, similar in size to onigiri.

During the Edo period in Japan, nigiri sushi became extremely popular and was sold at street stalls (yatai). It was similar to what we now call onigiri, eaten by hand. The term “onigiri” was used because the nigiri sushi of that time was about two to three times larger than today’s version. After finishing their meal, customers are said to have wiped their hands on the stall’s curtain (noren). As an aside, historical records describe Edo as a rather unsanitary city at the time, and this practice serves as evidence of that.

a photo of hand-washing devices (groove) — This is hand-washing devices (groove).

Later, in the 1950s, sushi restaurants began installing hand-washing devices (grooves) on the customer side of the counter. Instead of using hand towels, customers would wash their hands in the water and moisten their fingers before eating sushi. Some traditional sushi restaurants in rural areas still have these grooves today.

A photo of uni nigiri sushi — Recently, some high-end sushi restaurants have started serving nigiri sushi directly from the sushi chef.

Recently, some high-end sushi restaurants have started serving nigiri sushi directly from the sushi chef. This is particularly common with delicate ingredients like uni, which are prone to falling apart. In this case, customers are forced to eat nigiri sushi with their hands.

In the old days, Sushi was originally a food eaten with your hands.

a photo of Yubifuki — Yubifuki refers to cloths or gauze provided mainly at sushi restaurants for customers to keep their fingertips clean while eating sushi.

Even, for example, if you are in a prestigious sushi restaurant in Ginza, you can still eat with your hands. You can actually use your hands to eat the ginger (gari) too (Some guidebooks state that gari should be eaten with chopsticks, but no sushi chefs would ever say such a thing). Restaurants that prefer you to eat with your hands will provide an extra, smaller towel called yubifuki for cleaning your hands between sushi, along with the normal hand towel (Oshibori towel). Even then, feel free to use chopsticks if you prefer.

Anyway, using chopsticks for the first time can be challenging, but don’t worry – here is the ultimate guide to becoming an expert at picking up your favorite sushi without damaging it. You’ll learn how to use chopsticks like a pro.

Follow these simple steps to use chopsticks like an expert:

Hold the chopsticks by their thickest end.
Place the chopstick on the lower end of your hand in the gap between your thumb and index finger.
The chopstick on the top goes on the fingerprint of the thumb and index finger.
To pick each piece of sushi, move the upper stick with the help of your thumb, index, and middle fingers.

Follow the steps above and soon, you’ll be the one teaching your friends! Now you know how to pick up nigiri sushi with chopsticks!

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Revision date: June 17, 2025

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Why is sushi with tuna topping so expensive?

A purchase of raw tuna costs at least JPY 30,000 per kilogram. Furthermore, good tuna is judged not only by taste, but appearance is also highly regarded.

The surface is gradually oxidized by letting it sleep (mature) and the sushi chef makes sure that parts are cut of as they change color, when the timing is perfect for both the taste and appearance. In other words, skin is taken from the freshly purchased tuna, the meat of the fish darkened by blood (the blackened area that can’t be used as sushi toppings) is removed, the parts that have changed color are shaved off and then only the remaining, best parts used as toppings are left.

This is why the price is high.

Prior to WWII, there were chefs whose only job was making vinegar rice!

From the end of the Edo period through the Meiji period, rice was cooked using firewood and a pot. It is not easy to get the fire at the right temperature and the rice has to be cooked to the same texture regardless of where it came from or the size of the grains, so at the time the task required a skilled chef. Therefore, there were “Shari-ya” employed by sushi restaurants who specialized in cooking rice. “Shari-ya” focused on this single task and were not involved in the actual making of the sushi after the rice was passed on to the chefs.

Some notes on chopstick manners

There are manners in using chopsticks that tourists may be unaware of. We would like to introduce some of those here.

First of all, it is impolite to place chopsticks on your dish in the middle of a meal. Make sure to place them back on the chopstick stand when you aren’t using them.

It is also poor manners to stab food with chopsticks (Sashi-bashi) and or to use chopsticks to look through dishes. Please avoid breaking up the beautifully arranged dishes when you eat.

The improper use of chopsticks

1. Passing foods (Hiroi-bashi or Awase-bashi): Never use your chopsticks to take something from someone else’s chopsticks. This way of passing things relates to Japanese funerary customs (Kotsuage).

2. Drawing plates or bowls near you (Saguri-bashi): Don’t draw a plate or bowl toward you with chopsticks.

3. Touching foods unnecessarily (Utsuri-bashi): Don’t touch foods with chopsticks unnecessarily without eating them.

4. Scooping: Don’t scoop up food by using chopsticks like a spoon and bring them to your mouth.

5. Shoveling food into the mouth (Komi-bashi): Don’t put your lips on a plate or bowl and shovel food into your mouth with chopsticks.

6. Picking up plates or bowls while holding chopsticks (Nigiri-bashi): Don’t pick up a plate or bowl while holding chopsticks.

7. Pointing at someone (Sashi-bashi): Don’t point at someone with chopsticks.

8. Laying chopsticks across a plate or bowl: Don’t lay chopsticks across a plate or bowl.

9. They stuff their mouth full of food and push it in with chopsticks (Oshikomi-bashi).

10. Lick the chopstick tips (Neburi-bashi).

11. Hold it with chopsticks while dripping the cooking juices (Namida-bashi).

12. Eating the same food over and over again (Kasane-bashi).

Related contents: SUSHI RESTAURANT ETIQUETTE

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Revision date: March 1, 2024

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Tuna was not a premium fish during the Edo period!?

A painting depicting the large tuna catch during the Edo period

After the Kamakura period, it was said that “the sound of the voice calling “shibi” sounds like the day of death, which is ominous,” and when power was passed to the samurai, the word “shibi” became associated with “day of death,” and if a tuna lost its life in battle, it was avoided by the samurai as a good luck charm.

Tuna was mainly caught off the coast of Choshi, and was transported to Edo by boat, then placed on a cart and transported through the city of Edo, hidden by straw mats and covered with water. Tuna is large, and the fact that they looked exactly like Dozaemon, who had been drowned, was one of the reasons they were disliked. The fat in particular spoiled quickly, falling apart, and had a strong odor.

At this time there was no ice, so tuna had to be salted. It was cut into blocks, salt was spread all over and in it, and that was it. At Uogashi (the market before Tsukiji), it was treated at shops that specialized in salting fish. The dark, discolored, salty chunks of flesh really were nothing but “Gezakana”.

Gezakana －Relatively low-cost sushi ingredients, such as gizzard shad and horse mackerel. Bluefin tuna used to be also called gezakana in the Edo period, for losing its freshness easily.

This is why they were treated as a lower-class fish, but something changed around 1804-1818. At that time, soy sauce was widely used in the Kanto region, especially in Choshi, so a preservation technique was devised in which fillets of tuna were marinated in salty soy sauce and delivered safely while still raw. Needless to say, this is what we call today’s Zuke. This encounter with soy sauce helped to popularize tuna in the Edo period.

Tuna is originally caught in the open sea. However, due to some tidal current or abnormal weather, an incident occurred where large numbers of tuna were caught in nearby waters. This happened in 1832. It is said that as many as 10,000 were caught in one day. Because so many were caught, it spread, and Edo city was overflowing with tuna. Fresher tuna began arriving in Edo than before.

Around 1810, a new type of sushi was invented in Edo by Hanaya Yohei, in which fish fillets were sold on vinegared rice. Unlike traditional sushi that is fermented (such as narezushi), Kohei’s sushi is made by placing fish meat marinated in soy sauce on top of vinegared rice.

This fast-serving style marked the birth of modern edomae sushi and helped elevate tuna from gezakana to a prized topping in Japanese cuisine.

What makes a good sushi chef?

The balance between Shari (vinegar rice) and the topping is important in sushi. No matter how good the topping, the sushi won’t be good if the Shari isn’t right for it. More restaurants have been using red vinegar lately, but even if you use a Shari with a strong taste like red vinegar, the balance will be destroyed if the topping has a weaker flavor. Seasoning that goes well with various toppings that doesn’t stand out too much is ideal.

It works the other way, too. If the Shari is too weak, the sushi won’t be delicious no matter how good the topping. Even if the topping is not premium quality, if the Shari is matched perfectly, the sushi will be perfect. In other words, a good sushi chef is someone who can make sushi with perfectly matching toppings and Shari.

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Revision date: December 18, 2017

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Why do some sushi toppings contain ginger as well as wasabi?

Ginger is used for toppings with a strong, distinct taste and strong fishy smell such as bonito, horse mackerel and sardines. Ginger has the effect of eliminating odors, but be careful not to use too much, as the flavor of the seasoning may overpower the natural taste of the fish. It should be used solely to enhance the umami of the fish.

Additionally, ginger contains components such as “gingerol” and “shogaol,” which have strong antibacterial properties. These components are known to be effective against foodborne pathogens like O-157 and parasites such as anisakis.

Wasabi has a spicy taste and stimulates the senses of taste and smell and works to dull the senses so the fishy smell is not felt, but ginger is effective in actually extinguishing the fishy smell.

Because the effect of wasabi is transient and difficult to sustain, it is not a good match for fish with a peculiar odor in some respects. For this reason, it is often used with white fish that have a lighter flavor.

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Revision date: April 21, 2025

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You know toro tuna and akami, but have you heard of the more rare parts of the tuna?

A single bite of the same bluefin tuna differs greatly depending on the part of the fish it came from.

The body of the fish is broadly categorized into the dorsal (back) and the ventral (belly) sides, which taste completely different. Of course the meat near the head tastes completely different from the meat near the tail. If you dig even deeper, there are parts that aren’t as well-known as the Otoro (fatty), Chutoro (medium fatty) and Akami (lean) tuna meats. We’d like to explain those now.

1. Hachinomi or Tsunotoro Nouten

“Hachinomi (ハチの身) or Tsunotoro Nouten” is the meat from the crown of the head. It is fatty and rich and also called “Head Toro”. Only about 1kg of this precious meat can be taken from even a very large fish, and it is only shared with regular, loyal customers.

2. Kamatoro

“Kamatoro (カマトロ)” is taken from behind the jaw. It is known as “shimofuri (霜降り)” or marbled meat. There are no veins in this part so the meat is soft and the marbling is more detailed than Otoro, so it is sticky and melts in your mouth. The balance of fat and sweetness in this part is unparalleled. It can be said that otoro (such as shimofuri and jabara) of tuna is the representative part of toro tuna. This is an image of the shimofuri on the right, and the jabara (蛇腹) on the left.

3. Chiai

“Chiai (血合い)” is the part with the most veins, so it is a dark red color. It has a strong odor of blood and has multiple times the acidity of the lean meat, so it is not used as a sushi topping. Chiai is rich in iron and protein and is considered to be highly nutritious. Recently, it has been discovered that selenonine, an antioxidant found in high concentrations in tuna and mackerel, is effective in preventing lifestyle-related diseases, reducing stress, and promoting anti-aging.

4. Chiai Gishi

“Chiai Gishi (血合いぎし)” －Located right next to chiai, this is the meat you can taste the umami of the rich red meat and the sweetness of toro fat at the same time.

5. Wakaremi

“Wakaremi (分かれ身)” is a precious part with very little meat found next to the dorsal fin. The part especially close to the dorsal fin is popular and called “Setoro (背トロ)”. Setoro has both the umami of akami and the umami of fat. The fat isn’t overbearing so you can eat a ton. However, this part is hard to get, even in high-quality tuna and is not available except to regular customers in almost all sushi restaurants.

6. Tossaki

A sushi chef, Hiroyuki Sato, serves a tossaki hand roll as the first sushi piece of the course. “Tossaki (突先)” is an exclusive cut of tuna that goes well with sushi rice using red vinegar, which is less sour but has more umami and flavor compared with white vinegar. Because tossaki is the base of the tuna’s head and it moves a lot, there are a lot of muscular striations. Therefore it needs to be prepared using the back of a knife carefully as if peeling it off (Hagashi). It is said that tossaki is a high-tuna-flavor cut. A couple of Sato’s apprentices also offer a hand roll to open up the meal in the same way.

7. Tenpa

The meat of tuna gets leaner and muscular striations are fewer towards the inner center of the body. “Tenpa (天端)”, surrounding the spine, is deeper in color and tastes stronger. It features the tender texture coming from the finest meat quality. This is also called Tenmi (天身).

8. Hohoniku

A photo of Hohoniku maguro — The appearance of Hohoniku maguro nigiri

“Hohoniku (ホホ肉)” is cheek meat. The cheek meat of tuna is a rare part of the fish, with only a few hundred grams being taken from a 100kg fish. It is crescent-shaped, with one on either side. It can be taken from not only bluefin tuna, but also bigeye tuna, etc., but if you want to eat it as sashimi or nigiri sushi, you need to be careful about its freshness. Once frozen, it can only be used in dishes where the smell is masked by cooking with garlic, pepper, olive oil, etc.

Its cheek meat is juicy, stringy, and low in fat. When making nigiri sushi, it is often Aburi to soften the stringiness. Aburi enhances the flavor of this part of the fish. And there are almost no sushi restaurants that buy tuna heads or whole fish. Therefore, the only places that can offer this part of the fish are conveyor belt sushi restaurants and izakaya.

9. Hireshita

“Hireshita (ヒレ下)”－Below the “Wakaremi” is a section with white veins intertwined. This is typically used for Tekkamaki. This is because the white veins are tough and take a long time to remove. However, between the veins lies the fatty richness of Otoro and the red meat-like flavor of Chutoro, and carefully removing the veins reveals a delicious part. This truly is the valuable part of whether there will be even enough for 10 pieces of sushi from an over 200 kg tuna. This is written in a sushi manga named by Hiroshi Akiyama of Sushi Kin.

If you are fortunate enough to get an opportunity to taste these, you can take it as proof that you have been accepted as a regular and loyal customer. It is difficult to distinguish these parts by appearance alone, so make sure you try them at a sushi restaurant you can trust. Just for your reference.

We will explain fishing methods which could affect the quality of caught tuna.

There are mainly five methods for tuna fishing. “Ipponzuri” (catching fish with fishing poles) in Oma, Aomori prefecture, you see a lot through the media, is well known. However, the fact is that Long line fishing method and Purse seine fishing method are the ones catching the most tuna. The rest is Fixed net fishing method and Hikiami (Seine fishing method).

An illustration of Long line fishing method — Long line fishing method

To hang a long line (Mikinawa) in the sea, covered with about 3000 fishhooks attached to branch lines (Edanawa), aiming at a path of schooling tuna.

Purse seine fishing is a fishing method in which a large net is spread out in a circle and quickly envelops schools of swimming fish. Once the school is surrounded by the net, the bottom of the net is pulled up to make the enclosure smaller. The diameter of the circular net can range from 200 meters to 1,000 meters.

A large-scale method of fishing by encircling a school of tuna with a net. Although it is efficient, there is a demerit of lowering the quality of fish because they struggle while getting caught. In addition, other kinds of fish and immature fish can be caught without distinction and that leads to overfishing.

Tuna have a habit of migrating to the same ocean area at the same time each year. A coastal fishing method called Fixed net fishing consists of placing a net in the sea and wait for a school of tuna. The advantage of this method is to be able to capture the fish alive without causing any injury or damage.

An illustration of Ipponzuri — Ipponzuri (catching fish with fishing poles)

This method has the longest history and uses a pole of 4 – 6 meters to fish from a boat. Using a machine that winds up lines automatically and also using human hands, pull up tuna that weighs more than 100kg and lastly catch it by piercing gills with a harpoon.

To catch fish by towing a bag-shaped net from a boat.

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Revision date: June 2, 2025

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Today you will learn how to easily identify artificial salmon roe!

The natural salmon roe season is the autumn. Does this mean that most of the roe eaten during the off-season is artificial Salmon roe. Not necessarily. As stated in his biography, even at the famous sushi restaurant Sukiyabashi Jiro, frozen roe is thawed as necessary.

Long ago this was an extremely expensive topping that ordinary people couldn’t afford, so artificial roe was used. There was a time when this was the case. But nowadays salmon roe is regularly imported from overseas and can be obtained cheaper, eliminating the need to use artificial roe instead.

However, we cannot overlook the commercial law for passing off artificial roe as natural roe. In Japan, the non-perishable properties of artificial salmon roe made from chemical substances (mainly sodium alginate) is utilized and used mainly in hospitals, but not sold to the general public. I’ll also tell you that it is very rare to find a sushi restaurant that serves artificial roe. Cheap roe is generally made from eggs of trout, other related species, or imported from Canada and other countries.

Unfortunately I’m not familiar with the state of things outside of Japan, but I can tell you how to tell the difference. All it takes is hot water and a moment of observation. Artificial salmon roe will show no changes in hot water, but natural roe will start to turn white on the surface. This is due to the protein reacting and changing with the heat. That said, this is not an experience you can just set up at the sushi restaurant.

The following describes the artificial salmon roe composition. The nucleus of artificial salmon roe is made of red-colored vegetable oil, the thin outer film is made of sodium alginate or carrageenan, and the sol-like contents are made of polysaccharides derived from seaweed, Gum arabic, and Xanthan gum. While real salmon roe is high in polyunsaturated fatty acids, artificial salmon roe is high in saturated fatty acids derived from vegetable oils, oleic acid and linoleic acid.

As an aside…

What are the fish eggs on sushi called in Japan?

There are eight types of fish eggs served at Japanese sushi restaurants. However, not all of them are used for Nigiri sushi. Some are served as side dishes. Uni is sometimes translated as sea urchin’s roe, but it is actually the sea urchin’s genitals (testes and ovaries). Most people also don’t know that Tobiko and Tarako are not served at 99% of Edo-style restaurants. In other words, these toppings are only served at kaiten-sushi (conveyor belt) restaurants. The one type of roe topping that can probably be found at all sushi restaurants is Ikura. Even more types of fish eggs, such as Masago, Paddlefish roe and Hackleback roe are used in sushi overseas, but Japan remains more conservative. Of course, it’s only natural that fish substitutes are not well-received in the place where sushi was born.

Types of fish roe

Fish roe usually cannot be preserved as is, so it is salted or smoked to make it last longer. Today, thanks to advances in freezing technology, frozen fresh fish roe is also available, but as a raw material for processing, fish roe is often salted to reduce its water content and then frozen for preservation. Nutritional value is generally high in fat and protein and low in carbohydrates, with higher calories and cholesterol than the meat of the parent fish.

What is Ikura? － It is Salmon roe.

What is Kazunoko? － It is Herring roe.

What is Sujiko? － It is Salmon roe that is still within its egg membrane.

A photo of Sujiko — Sujiko’s nigiri sushi is quite unique.

What is Tobiko? － It is Flying fish roe.

What is Tarako? －Tarako is the salted ovary of Alaska pollack. It is often colored red with food coloring. Karashi-mentaiko is Tarako marinated in a seasoning solution of salt and chili peppers, and is a well-known Hakata specialty. The name Karashi-mentaiko comes from the Korean word for Alaska pollack, Mentai.

a photo of Tarako nigiri sushi — Tarako nigiri sushi is very rare, even in conveyor-belt sushi.

What is Caviar? － It is Sturgeon roe.

A photo of caviar — Caviar is not used in Edomae sushi.

What is Karasumi? －It is made by salting, aging, and drying the ovaries of Flathead gray mullet (Bolla).

A photo of Dried mullet roe (Karasumi) — The appearance of Dried mullet roe (Karasumi)

The product resembles Chinese ink karasumi, hence the name. Good ones are candy-colored, cut into thin slices, lightly roasted, and served as nibbles for drinks. Imports have been increasing recently, but the most famous domestic product is karasumi from Nomo, Nagasaki Prefecture.

What is komochi konbu? － It is Herring spawn on kelp.