Nuka-daki is Kokura's local fish dish, made by simmering mackerel, sardines or similar fish with fermented rice-bran bed. It is also known locally as nuka-miso-daki or jinda-ni.
How it differs from nuka pickles
Nuka pickles are vegetables or other ingredients pickled in nuka-doko. Nuka-daki uses that nuka-doko in the simmering liquid for fish. In other words, the rice-bran bed becomes both a fermenting medium and a seasoning.
Why it works with oily fish
Kokura is surrounded by seas where fish such as mackerel and sardines were readily available. The richness of oily fish, the fermented aroma of nuka-doko, and spices such as chili and sansho create a depth different from ordinary simmered fish.
Why it matters in Kokura
Nuka-daki is certified as a 100-year Food by Japan's Agency for Cultural Affairs and is also introduced as a local dish by the Ministry of Agriculture, Forestry and Fisheries. Eating it in Kokura is a direct way to encounter the area's food culture.
Source: Kitakyushu City, Research Report on Rediscovering the Food-Cultural Value of Kitakyushu's Local Dish Nuka-daki (March 2025).