Jappa-jiru

Jappa-jiru is the local soup of Tsugaru in western Aomori, and its name tells its nature: jappa is Tsugaru dialect from zappa, meaning the rough, discarded parts — the fish head, bones, skin and guts left after the flesh is removed. In a cold region where preserving fish was a way of life, households would buy a whole large cod, take the flesh for other dishes, and simmer the remaining scraps into a soup, dried cod and its ara used the same way. Cod holds a special place in the Tsugaru New Year: it is the toshitori-zakana, the fish eaten to see out the old year, so central that locals speak of tara-shogatsu, a cod New Year. Fishermen's families are said to have cooked it at the harbor to celebrate a big catch, using homemade miso, to warm the men coming in from the winter sea.

A rich, briny broth thick with the body that only bones and skin give — faintly sweet, deeply savory, a little slick from the dissolved liver. The cod head and collar yield soft, gelatinous flesh you pick from the bones, the daikon has gone translucent and soaked through with the fishy-miso stock, and the negi adds a sweet fresh edge against the heat. It is rustic and generous, full of bits to nibble off the bone, the kind of soup that warms you from the core on a frozen day.

The dish works because the discarded parts are the flavorful ones. Simmering the cod head, bones and skin extracts gelatin from the collagen in the connective tissue and around the joints, which gives the broth its body and lip-coating richness, while the bones and trimmings release inosinate, the savory nucleotide concentrated in fish, that pairs with the glutamate of the miso for a combined umami far beyond either alone. Stirring the cod liver in at the end emulsifies its fat into the hot broth, adding a deep, slightly sweet richness — the same move that defines the dish's heartiness. Cod is well suited to this: its lean white flesh and large bony head give a clean, gelatin-rich stock without heaviness. Daikon is added early to soften and absorb the stock, the miso late so its aroma is not boiled off.