Nukazuke and the Nukadoko Bed (糠漬け・糠床)

Vegetables fermented in a bed of rice bran, salt and water - a living culture handed down and stirred in Japanese kitchens.

The bed (nukadoko)	Rice bran (nuka) mixed with salt and water to a mortar-like bed, inoculated naturally and by vegetables carried in it
What ferments it	Lactic acid bacteria living in the bed sour the vegetables in roughly one to two days, depending on temperature and size
Care in principle	The bed is stirred regularly to let in air and kept at a steady cool temperature - a daily-care culture, unlike a sealed jar

A nukadoko is less a recipe than a household pet: families feed it bran and salt, stir it, and bury the day's cucumber or aubergine in it. Some beds are said to be generations old, topped up rather than restarted.

This guide gives the system and the buying facts, not a starter procedure: establishing a bed safely depends on ratios and handling that belong to a maker's or a public food-safety source's complete directions. Ready-made nukadoko packs - bran already mixed and matured - are sold in Japan and in some Japanese grocers abroad and are the practical entry point; chilled fresh nukazuke itself rarely travels.

Taste guide: expect a deep, tangy sourness and the bran aroma underneath. Beginners usually meet nukazuke first as cucumber or daikon served beside rice in a set meal in Japan.

Nukazuke and the Nukadoko Bed (糠漬け・糠床)

See also