Dunaiskyi Oseledets (дунайський оселедець, salted Danube herring)

The first thing is the shine. A good Danube herring flashes blue-silver in the hand, then turns satin-soft after a few days in salt, the flesh oily and clean, the belly rich enough to make black bread feel necessary rather than polite.

This is not the harsh barrel herring some people know from dusty jars. Dunaiskyi oseledets, Danube herring, wants a lighter hand: enough salt to cure and firm the fish, not so much that you have to punish it back into life with endless soaking. Aunt Nadia wrote once, maddeningly, "salt it until it behaves." What she meant was this: the skin tightens, the flesh loses its raw softness, and the smell changes from river and iron to something round, marine, and appetizing.

The onion matters because the fish is oily. Slice it thin, rinse it if it bites too hard, then let it sit with vinegar, a pinch of sugar, and dill while the herring rests. The sharp onion cuts the fat, the unrefined sunflower oil brings that green-gold nutty glow, and the bread catches everything that tries to escape.

Serve it cold, generous, and a little messy. This is food for a table with glasses already poured, boiled potatoes somewhere nearby, and someone reaching across you before you've even sat down.