Edomaesushi | Sushiblog－Sushiuniversity

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.

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.

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.

A photo of Herring spawn on kelp (Komochi konbu) — The appearance of Herring spawn on kelp (Komochi konbu)

What is komaiko? － It is Saffron cod roe.

A photo of Saffron cod roe (Komaiko) gunkan — The appearance of affron cod roe (Komaiko) gunkan

What is Capellinko? － It is Capellin roe.

a photo of Capellinko gunkamaki — Capellinko (Capellin roe) is a substitute for Tobiko (Flyingfish roe).

What is Madarako? － It is Pacific cod roe.

What is Masuko?－ It is Humpback salmon roe.

a photo of Masuko gunkanmaki — In Japan, Humpback salmon roe is called Masuko and Chum salmon roe is called Ikura.

What is Masago? －What’s the difference between Tobiko and Masago?

Just for your own information.

Related contents：

What is Artificial caviar?

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Revision date: August 23, 2024

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Why aren’t the prices included on the menu at sushi restaurants?

If you visit a premium sushi restaurant, such as one that places piles of salt by the entrance for good fortune, you’ll notice there are no price displays.

There’s not even a menu. All you find is a slab of wood hanging down the wall with names of the daily offerings such as Conger Eel (anago) or Spotted Shad (kohada).

This is not a place to get angry and ask how customers can order without knowing the price. First time customers may not know the market price and worry about budget, resolving to pay with a credit card if they don’t have enough cash in their wallet.

I guess you could say that sushi restaurants that don’t display prices are accepted by customers as being more traditional, like the old days. But actually, at pre-war sushi restaurants, there were wooden panels that listed prices such as “Fatty Tuna: 2000 yen”. It was during the 1960s that they stopped displaying prices.

The 60s was the start of an era of high-growth in Japan. Prices were rising rapidly and sushi prices also went up drastically. At the same time, the business practice of entertaining clients was gaining popularity and suddenly about 80% of the clientele of high-quality sushi restaurants were these types of business groups, rather than individual customers.

In situations like these, if there was a sign that read “Medium Fatty Tuna: 3000 yen” then it makes it difficult for the business guest to order what they like, without worrying about the price. Considering the total bill, they may also order fewer dishes than they want. As you can see, this practice of not displaying prices at sushi restaurants was in consideration for the business customers who were entertaining clients, as well as those being entertained as clients. At the same time, the well-known “Omakase” was created, the “chef’s choice” system in which the customer orders a menu created by the chef on the spot.

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Revision date: October 23, 2017

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Why is sushi eaten with sushi sauce (shoyu)?

There are many different things all over the world that are share the name “sushi”. However, when Japanese people hear this word they think of “nigiri sushi”. Of course outside of Japan, it probably more commonly refers to sushi rolls.

Similarly, the way soy sauce is used also differs greatly between people in Japan and those in other countries. The soy sauced used for nigiri sushi is not used to add salty flavor to the sushi. The reason it’s used is to subdue the fishy odor of the fish and to add the many amino acids contained in soy sauce to nigiri sushi, which brings out the umami synergistic effects. Think of it more like an important background role to the sushi that isn’t meant to stand out. Meanwhile, since sushi rolls and other sushi dishes overseas are generally eaten after being cooled, the flavor is subdued, leading to using large amounts of soy sauce.

There is also a big difference in the concept of sushi sauce. In Japan, there is no such word as “sushi sauce”. Neither chefs nor the general population has heard this term. However, the term is easy to imagine what it would be, so hearing the word “sushi sauce” would probably lead Japanese people to assume it meant nikiri shoyu or nitsume, which are used in nigiri sushi. Also, soy sauce, or “shoyu” as it’s called in Japanese, is not considered to be a type of “sauce” in Japan. But what about in other countries? Sushi sauce has a distinctive, assertive flavor and is added to bring out multiple layers of flavor. There are also many types of sushi sauce such as sriracha sauce, spicy mayo, mango sauce, ponzu sauce, tonkatsu sauce, eel sauce, tamari sauce, teriyaki sauce, dynamite sauce and others. They each play an important role in bringing out the flavors of sushi rolls that otherwise wouldn’t be apparent.

In other words, as the definition of sushi definition changes across borders, the definition of sushi sauce changes too. However, what both sushi sauce overseas and Shoyu in Japan have in common is that they complement the sushi they are used for.

Now we would like to explain a bit about the Shoyu used in nigiri sushi.

Edo style sushi was created during the Edo period in Japan (1804-1830). The expansion of the soy sauce culture of the Edo area (currently Tokyo) had a big influence on the creation of Edo style sushi. In a time when refrigeration and other technology had not yet been developed, soy sauce played an important role not only in taste, but also in preservation. A surprising number of tasks in the Edo style utilize the scientific effects of soy sauce.

First of all, lightly applying just a small amount of Nikiri shoyu (sushi sauce) on the sushi topping, brings out its flavor and creates a glaze. To put it scientifically, this a clever use of the odor eliminating effects of soy sauce, eliminating the raw odor.

Also, long ago zuke (soaking in soy sauce) was also used for fish other than tuna. This was a way to utilize the bacteriostatic effects of soy sauce, which stop the growth of Escherichia coli (E. coli).

Tsume (sushi sauce) represents the thermal effects of soy sauce. By adding soy sauce, mirin and sugar then boiling down, the amino acids in the soy sauce and the sugar react and the goal is to create a delicious glaze and a nice scent that stimulates the appetite.

Adding a small amount of soy sauce when making rolled egg omelets has the effect of enhancing and bringing out the flavor and sweetness of the ingredients.

Soy sauce is generally overshadowed by the sushi topping and vinegar rice, but soy sauce plays an important role in bringing out and enhancing the delicious taste of the sushi.

Sushi Sho (in Hawaii)

Sushi Sho (in Yotsuya) is a restaurant where you cannot make a reservation easily. Its founder, Keiji Nakazawa, can be described with a keyword of having raised so many disciples. And the point, they run sushi restaurants that are also hard to make reservations, leads to how Nakazawa’s ideal sushi master should be. Having such a great intriguing personality, Nakazawa left his safe haven “Sushi Sho” in the hands of disciples. September 2016, he opened up Sushi Sho (in Hawaii) in The Ritz-Carlton Residences, Waikiki Beach on Oahu. We can’t take my eyes off that now.

Address：383 Kalaimoku St, Honolulu, HI 96815

http://www.ritzcarlton.com/en/hotels/hawaii/waikiki/dining/sushi-sho

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Revision date: October 9, 2017

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Kozasazushi (in Shimokitazawa)

Kozasazushi (in Shimokitazawa) was opened by the legendary sushi chef, Shuzo Okada (passed away in May 2004). His successor, Tsutomu Nishikawa was, of course, his apprentice. The Omakase course is not an option at this restaurant. The only way to order is to look at the topping board and choose for yourself. This is a shop for experts and may be difficult for guests who can’t read or speak Japanese.

Address：3-7-10 Daizawa Setagaya-ku, Tokyo (10 minutes walk from Shimokitazawa Station)

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Revision date: September 29, 2017

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A Guide to Avoiding Food Fraud!

It is true that in an age when aquatic resources are being depleted, there is a worldwide demand for a substitute for luxurious fish. However, although it’s not easy to tell fish apart once it’s sliced, that doesn’t mean that restaurants should not be held to certain standards. Here we present a number of severe cases.

First of all, Opah belly meat with some fat is used for the tuna in Negi-toro (tuna minced with Welsh onion leaves). Opah is widely distributed in warm seas and it’s known to be inexpensive with a smooth taste. The price is less than 1/100 of the Pacific bluefin tuna and if possible Negi-toro made from Opah should be avoided.

Next let’s discuss Japanese conger, an essential Edo-style sushi topping. A substitute for Japanese conger is the Common snake eel, which is a type of sea snake from Peru. The taste is pretty good, but the skin is rubbery and it doesn’t stick to the Shari (vinegar rice) so it’s instantly apparent that it’s a substitute fish. If you find Japanese conger at kaiten-zushi for JPY 100 per plate, you might want to question the source.

A premium sushi topping is the Mirugai clam (also called Hon-miru). This shellfish is characterized by its unique texture and taste. Instead the Japanese geoduck (Shiro-miru) is used, which sells for half the market price. However, the taste of the two is so similar that even Sushi Tsu has mistaken them, which is great news for dishonest dealers.

In April 2015 the Food Labeling Act was revised, leading to progressive reduction of fraudulent labels, but it is not a solution that eradicates dishonest dealers so consumers need to be educated and aware.

So verhalten Sie sich in einem Sushi-Lokal richtig

Hier lernen Sie alle Benimmregeln, die nicht nur in Sushi-Lokalen, sondern in allen Gaststätten Japans gelten. Das Wichtigste ist wohl, auf andere Rücksicht zu nehmen sodass sich andere Gäste im Lokal nicht gestört fühlen. Rücksichtnahme – das ist wohl das Wesentliche im japanischen Leben. Bitte merken Sie sich die hier aufgeführten Punkte.

・Bitte kommen Sie nicht zu spät, halten Sie die Reservierungszeit ein.

・Bitte nehmen Sie den Ihnen zugewiesenen Platz

・Selbstverständlich ist es absolut unerwünscht, im betrunkenen Zustand laut zu reden oder andere Gäste anzupöbeln

・Aufdringliche Gerüche wie zu starke Parfüms sind nicht erwünscht

・Rauchen ist natürlich nicht erlaubt

・Wenn Sie Fotos machen wollen, fragen Sie bitte vorher den Geschäftsinhaber und die anderen Besucher um Erlaubnis

・Es gibt zwar keine bestimmte Kleiderordnung, doch es ist ratsam, sauber und dem Anlass entsprechend gekleidet zu sein.

・Telefonieren im Lokal ist nicht erlaubt

・Legen Sie bitte keine kantigen Gegenstände wie Ihr smartphone oder Ihre Uhr auf die Sushi-Theke, da diese aus empfindlichem Holz gemacht ist

・Sich all zulange mit dem Sushi-Meister zu unterhalten ist kein wirklich cooles Benehmen

・Bestellen Sie bitte nicht immer nur Sushi mit dem gleichen Belag

・Ein Ihnen vorgesetztes Sushi sollte sofort verzehrt werden. Optimal ist: Innerhalb von 10 Sekunden.

・Mit der Hand oder Stäbchen – Sie können Sushi essen, wie Sie wollen

・Um das delikate Gleichgewicht von Reis und Sushi-Belag optimal zu geniessen, sollte man am besten das ganze Sushi-Stück in den Mund stecken. In diesem Sinne ist davon abzuraten, den Belag vom Reisklumpen zu trennen.

・Fische und Meeresfrüchte aus natürlichem Fang schmecken in der jeweiligen Saison am besten. Wir empfehlen, saisongerechte Beläge zu wählen.

・Dippen mit zu viel Sojasauce ist nicht ratsam. Der Sushireis saugt die Sojasauce schnell ein und dann zerfällt der Reis in Klumpen. Zu viel Sojasauce stört auch den feinen Geschmack des weissen Fischfleischs.

・Eine geregelte Reihenfolge gibt es beim Sushi-Essen nicht. Sie können völlig frei wählen, mit welchem Sushi Sie starten und welchen Sie als nächsten essen.

・Ein echter Sushi-Kenner bleibt nicht noch lange sitzen, wenn er fertig gegessen hat. Sich nach dem Essen zu lange in einem Sushi-Lokal aufzuhalten, gilt in Japan als uncool.

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Revision date: September 5, 2017

Is Nigiri sushi made by a Master Really Transparent?!

Some of the shari drops off of the sushi placed in front of you by the chef saying, “Sorry to keep you waiting.” You may be served this kind of nigiri sushi at restaurants that have lines out the door. Of course sushi that falls apart before it even touches your lips is a failure.

Good nigiri sushi looks solid, but once you put it in your mouth the shari naturally loosens. Next the loosened rice absorbs the taste of the topping and it doesn’t stick to the roof of your mouth. On the other hand, with shari of sushi that has been pressed too strongly, the taste of the topping is left in your mouth, getting in the way of new flavors.

In other words, the sushi looks hard on the outside, but it soft on the inside. This is the perfect recipe for sushi.

When first learning, chefs are only concerned with shape and press the pieces too firmly. Next they let up on the force a bit and once they find the perfect amount of pressure, they become a real sushi chef. A master sushi chef is one rank above that and makes sushi that light can pass through. The sushi must be pressed gently enough for light to pass through, but firmly enough so that the sushi holds its shape.

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Revision date: August 28, 2017

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Is there a certain order for eating sushi?

How to eat sushi properly

During the Edo period when Nigiri sushi originated, it was sold in food stalls. People chose the sushi topping they wanted and satisfied their hunger. There is no such thing as the order of eating. In the first place, there are no rules about how to eat food.

The order in which the food is eaten is at the discretion of the eater.

You can eat Nigiri sushi in any order you like. We dare say that the order of eating dessert first, then the main meat or fish dish, and finally the appetizers is not a good one. Something similar to this even exists in Nigiri sushi.

Recently, Nigiri sushi has become a mainstream dish served in the Omakase course, in which the sushi chef has thought of the best order to eat the sushi. In this case, the sushi chef has thought of the best order in which to eat the sushi. The eater is left to his/her own choice.

Since when do we care about the order of eating?

This is due to the internationalization of Nigiri sushi. Everyone is taught how to eat a dish for the first time. And if you don’t know much about sushi topping, it is only natural that you would want to know more about it.

Generally, start by eating fish with a lighter flavor like white fish and move onto fish with a heavier flavor such as Toro, Uni, Japanese conger (Anago), and then Egg (Tamagoyaki). Finishing with Seaweed rolls at the end is a typical way.

The following menu is an Omakase style at the Former 3 Michelin star restaurant in Ginza. Since Sayori is offered, one can imagine that the season is early spring. This menu is composed of sushi topping that changes as the seasons change.

Begin with white fish?

Marbled flounder (Makogarei)

Striped jack (Shima aji)

Golden cuttlefish (Sumi ika)

Akami

Chutoro

Otoro

Gizzard shad (Kohada)

Common orient clam (Nihamaguri)

Horse mackerel (Aji)

Kuruma prawn (Kuruma ebi)

Japanese halfbeak (Sayori)

Common octopus (Madako)

Mackerel (Saba)

Ark shell (Akagai)

Uni

Salmon roe (Ikura)

Japanese conger (Anago)

And Omelette (Tamagoyaki) comes last, just along the general order. Perhaps the way this owner serves might have become common.

To maximize each flavor of toppings, have some pickled ginger or hot tea between different types of sushi to cleanse your palate. You don’t have to stick to the specific order, though. It seems like having customers eat freely is the idea held in common by most sushi chefs. However, indeed, you won’t be able to taste the next flavor after eating something rather sweet. Japanese conger (Anago), Egg (Tamagoyaki), and Kanpyoumaki should be eaten at the end.

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Revision date: January 29, 2024

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Tsujiki wholesale fish market

We went to Tsujiki wholesale fish market today also, and actually got to enter at the time all food professionals are buying and selling.

The tuna auction begins at 5:00 am. Then about 6:30 am, intermediate wholesalers start lining up their winning bid tuna. Therefore, it is around the time when people like masters from sushi restaurants come to buy fish. Once professional deals settle down at 10:00 am, all the other visitors and foreign tourists are allowed to get in the market.

What exactly is the difference between on what is going on before and after 10:00 am? That is how determined sellers and buyers are. It is entirely full of sprit because it is a place for exchanging valuable information.

This is one situation I saw how they interact. As they talk about how Tuna, air transported from Boston, is fatty but doesn’t have any flavor of Tuna compared to the inshore ones, they let me try a piece. The one from inshore definitely tastes more as Tuna for sure.

“I’ll take about a 20cm width of the belly, around this part of the inshore one.”

“That will be around 4.3kg?”

Pro talk, isn’t it?

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Revision date: August 15, 2017

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寿司店的礼仪

这里提到的各项事宜不仅仅是寿司店特有的礼仪，也适用于日本的所有饮食店。简单概括为一点，就是不影响到其他客人就可以了。请参考下列各项。

预约好的时间不能迟到。

坐在指定的座位上。

禁止饮酒后大声喧哗，干扰其他客人。

不可过度使用香水。

禁烟。

不可随意摄影。

不需要穿礼服，但是务必服装得体。

不可打电话。

木制的餐台很容易划伤，所以不要将手机或手表等放置于上。

不可沉迷于交谈，独自占用店主时间。

不可只点同一品种的寿司

目标10秒内将捏好的寿司吃掉。

用手或者筷子吃都可以。

寿司米饭和海鲜食材有着绝妙的平衡搭配，尽量请一口吃掉。正因如此，将寿司米饭和食材分开的行为是不可取的。

应季的鱼肉中富含饱满的脂肪，是最美味的。所以如有机会请务必品尝应季的食材。

寿司米饭不可直接蘸酱油。寿司米饭有着吸收酱油的性质，寿司不仅会松散开，过多的酱油也会盖过白身鱼肉等细腻的味道。

品尝顺序没有限定，可以自由决定。

品尝结束后马上站起来才是成年人的行为。不要久坐。

寿司图鉴

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Revision date: August 10, 2017

Once you try Kuruma ebi sushi, you’ll never want any other shrimp.

Cultured shrimp like Black tiger is imported to Japan from India, Vietnam, Indonesia, and other places and it used in a lot of nigiri sushi. The shrimp used in sushi rolls is generally the giant tiger prawn. It is used because the price is cheap and it becomes a beautiful vermilion color when boiled. Unfortunately, it doesn’t have the sweet taste normally associated with shrimp.

On the other hand, the Kuruma prawn (kuruma ebi) that is offered at Edo-style sushi restaurants has a rich aroma and sweetness than spreads over your tongue. It is also becoming more popular to boil it just before serving it to the customers. By doing this, the warmth enhances the sweetness of the shrimp.

The old Edo-style sushi restaurants will also ferment the shrimp in eggs scrambled with sweet vinegar (yolk soaked in vinegar) for several days. When the Kuruma prawn is soaked in the egg, its umami is enhanced and its pleasant acidity is delicious.

By the way, when you boil the shrimp, it normally bends towards the belly. Crooked shrimp cannot be used for sushi, so a few cuts are made in the ventral to stop it from bending and it is cut along the muscles or from head to tail and skewered before boiling. You still have to be careful it doesn’t bend when you peel off the shell. Therefore, even just the way a Kuruma prawn is boiled demonstrates the skill of a sushi chef.

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Revision date: August 7, 2017

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Why is Zuke used for lean meat?

Zuke is one of the traditional Edo-style sushi methods. It is said that it was started in the Edo period to stop tuna from rotting when there were large amounts of the fish in the market. Now that there has been advances in refrigeration technology, it’s no longer necessary, but maturing the fish gives it a completely different taste and brings out its umami. Zuke is divided into two broad methods. Here we describe the characteristics of each.

Recently, most sushi restaurants incorporate the “Single Zuke”.

Each slice of tuna is soaked separately, so it can mature quickly. The immersion time is only a few minutes. The idea is to marinate just enough so that the tuna’s aroma remains and the soy sauce doesn’t overtake it.

On the other hand, the old Edo-style method is to perform Zuke after parboiling.

Parboiling means to wrap the fish in a wet cloth, and poor boiling water on the wrapping until the color of the tuna changes color, then turn the fish over and repeat the process. The fish is then put in ice water so the heat doesn’t go too deep in the meat. It is immediately removed once it cools so that it doesn’t get too watery. The tuna is then put in Zuke soy sauce and left to marinate for about half a day. In this method, the soy sauce only soaks into the surface part where the color changed from the parboiling, so the flavor of the tuna remains.

Both methods keep the maximum tuna flavor possible. Tuna is an essential part of Edo-style sushi. There is great diversity between sushi restaurants in the parts, marinating time and flavor of Zuke, which creates a new, original flavor when the lean meat of the tuna soaks up the soy sauce. The fattiest cuts of tuna are most popular. The lean meat has only become more popular due to a rekindled interest in zuke, but in fact during the peak of the bubble economy, there was a time when high-end restaurants in Ginza didn’t know what to do with all their leftover lean tuna meat. It’s almost unbelievable to think of it now.

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Revision date: August 1, 2017

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Is it polite to use Gari as a brush to apply soy sauce?

Using too much soy sauce spoils delicious sushi so make sure to only put a bit of soy sauce in the special dish. Make sure to tilt the sushi to the side and put just a dab on the end of the topping. Gari can be used as a brush to apply soy sauce to sushi rolls since they cannot be tilted. However, there are differing opinions as to whether this is a refined way to eat or not. Many people say it was basically made up by a publishing company. You just need a few drops in the soy sauce cruet. Actually at very fancy establishments the sushi is served with Nikiri so normal soy sauce is never used for dipping.

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Revision date: July 26, 2017

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Isn’t it true that fish is all about the freshness??

It’s a well-known fact among professional chefs that some fish don’t rely solely on freshness. Of course there is importance in freshness, but that’s just one element. It’s generally understood that flavor and taste improve with time (maturity).

The umami* found in the meat of the fish is essentially inosinic acid and glutamic acid. After a certain amount of time has passed after a fish has died, the body stiffens and not long after that the rigor lets up. The inosinic acid, which the umami is composed of, comes after the fish has stiffened. It then accumulates in the process of the body relaxing. This is the same in beef and pork in which there is no umami in the meat unless it is hung and matured for a time.

Therefore, ikizukuri sashimi that is still twitching usually won’t have the taste or depth of umami. However, the firm texture of sashimi is also an undeniable enjoyable aspect. It is not all about the umami.

*Glutamic acid, Inosinic acid and Guanylic acid are representative components of umami. Guanylic acid is found in kelp and vegetables (tomato, Chinese cabbage, green tea, etc.) as well as Parmesan cheese, inosinic acid is found in fish (bonito, macheral, sea bream, etc.) and meat (pork, chicken, etc.) while Guanylic acid is abundant in mushrooms (especially dried shiitake mushrooms).

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Revision date: July 17, 2017

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