Description
Nukazuke is an alkaline pickling technique that uses ash to create a high‑pH environment, inhibiting spoilage microbes while promoting lactic‑acid bacteria.
Technical
The dissolution of wood or rice‑hull ash releases sodium carbonate, sodium bicarbonate, potassium carbonate and trace minerals, raising the pH to 9–10. This alkaline milieu suppresses pathogenic bacteria such as *Clostridium* and *Pseudomonas* while creating favorable conditions for lactic‑acid bacteria to ferment vegetable sugars into lactic acid, which imparts a mild sourness and umami flavor.
Science
Primary Reaction
Alkaline hydrolysis of ash compounds and lactic‑acid fermentation
Sensory Profile
Aroma ()
earthymineralmildslightly sweetumami
Origin & History
Civilization
Japanese
Era