Sake no Ruibe (鮭のルイベ, Hokkaido frozen salmon)

Raw river salmon makes sensible cooks pause. Good. That pause is wisdom, not timidity. Sake no ruibe is not a dare and not a trick of seasoning. It is Hokkaido salmon frozen hard, sliced while still icy, and eaten before it loses its chill.

The one detail that decides it is the freezing. Traditional cold did two jobs at once: it preserved the fish and made raw salmon safer by killing parasites. In a modern kitchen, don't trust a warm-weather balcony or a cheerful little freezer that sighs every time you open it. Buy salmon sold for raw use, or use salmon that has been commercially frozen for parasite destruction. Sourcing first, always. The knife only protects what the fishmonger has already made possible.

Slice the salmon before it fully thaws. When the flesh is firm enough to resist the blade, you can cut clean faces without bruising, and each piece will soften slowly at the table. That is the pleasure of ruibe: cold at first, then sweet, then rich. Serve it simply with shōyu and wasabi, perhaps a little grated daikon to clear the palate. Nothing hidden. The fish tells you whether you chose well.