Kaburazushi (Koji-Fermented Turnip and Yellowtail)
Thick rounds of salted turnip are slit into pockets, stuffed with commercially salted yellowtail from a licensed seller and buried in layers of sweet rice koji, where turnip and fish ferment together in the fridge for 7 to 10 days. Because the fish is never cooked, pregnant people, older adults, children and anyone immunocompromised should avoid home-fermented versions. Any spoiled smell, mold or unusual gas means the whole batch is thrown out untasted.