There are a few types of nuka used to make nukadoko, a fermented rice bran bed for pickling.

There are a few types of nuka used to make nukadoko, a fermented rice bran bed for pickling.
*Plain rice bran- Simply roasted rice bran without additives.
*Pre-mixed rice bran- Contains salt and basic seasonings such as kombu or shiitake powder.
* Pre-mixed rice bran with koji- Includes koji (a fermented starter), along with salt and umami-rich seasonings like kombu or shiitake powder.