Tataki is a famous Japanese preparation of various types of fish and meat. This bonito is seared on the outside, but still beautifully raw on the inside. When you defrost the Katsuo tataki at home and slice it into thin pieces, there is a wonderful contrast in taste and appearance between the seared exterior and the silky, deep-red interior. This is incredibly delicious with a topping of soy sauce (from Hokkai!), spring onion, and ginger.