This is Katsuo no Tataki... ( broiled bonito ) I bought a package at department store today. ( It is usually already broiled. ) The surface is broiled and then chilled by ice cold water to eliminate the fishy smell.
For bonito, sliced garlic or grated ginger is recommended. Not wasabi. In the photo, the bottom small plate has Yuzupon ( Yuzu flavoured vinegar soy sauce ) for that. On the upper left, Rakkyo ( I pickled early this month ) , which is crunchy and well seasoned now. Plus steamed rice and miso soup ( with Komatsuna--- spinach like green vegetable) was my dinner tonight.