Geso is not the name of a fish or shellfish.
Geso refers to the 10 arms/tentacles of a squid.
The reason squid arms came to be called “Geso” is that the shoes that are removed before entering the indoors in Japan are referred to as “Gesoku”. The name comes from a time when restaurants used to hold onto their customers shoes and the cloak would tie them with a string in 10-pair units.
Geso can be lightly boiled or grilled. For large squid, a butcher knife is inserted at the tip of the arm to peel off the skin membrane, and then the tips of the arms are cut off so the sizes match. When Nitsume or other sauce is applied and it is made into Nigiri, it has an excellent springy texture and scent of the sea. It is also used as Tsumami when drinking alcohol. In my personal opinion, the Geso child of Sumiika is nice and soft and worlds above any others.
This is one of the sushi terms that even most of the general public in Japan knows well.
We hope this information will be helpful.
Revision date: January 4, 2023