Iwashi no Unohana-zuke (Vinegared Sardines with Okara)
Small sardines cured first in salt and then in vinegar are opened flat and filled with sweet-sour okara, the soybean pulp left from tofu making, with a thin coat on the skin side too. The okara, cooked dry with carrot and dried chili and then brightened with yuzu zest and juice, comes across soft, citrusy, and tangy against the firm, vinegared fish. This Ibaraki dish is eaten the day it is made, and only sardines sold for raw eating after commercial freezing will do, since salt and vinegar do not kill anisakis.