Kazunoko herring roe, usually served marinated in sake, broth, and soy sauce, sometimes served raw, kazunoko konbu. Saba mackerel, almost always served after being lightly salted and marinated for a few days, so really cooked. Raw mackerel is sometimes served but it must be extremely fresh as it goes off quickly. Sake Rice wine. Served both hot and cold.
Some people love it, some people hate it.
Sashimi Raw fish fillets sans the sushi rice. Sawara Spanish mackerel. Very different from aji, which is Japanese Mackerel. It will probably not be on the menu, ask for. The sweetened, pickled rice.