Tokishirazu refer specifically to young chum salmon which accidentally get lost and as a result get caught up “out of season” along with other fish from the cold and fast waters of Hokkaido around May/June. Because it is sexually immature (and also partly due to survival needs in colder waters), tokishirazu retains a much higher amount of fat (10-30%) than the usual adult salmon (usually <10% fat).
Translation: This stuff is absolutely delicious. Rich like o-toro, but totally different in feel and flavor - Probably the best salmon you’ve ever had. And those of you who eat at Kiriko regularly are already aware that Ken-san and his crew know their salmon and do it right.
Kiriko has one or two of these tokishirazu right now. That is all. Onegashimasu.