Kuro-Su Black Rice Vinegar Aged Fermented
Kagoshima Prefecture (Fukuyama Town) — outdoor ceramic jar fermentation tradition
Kuro-su (黒酢, black vinegar) is Japan's aged rice vinegar, made by fermenting unpolished brown rice in ceramic jars outdoors under direct sunlight for 1-3 years — the long outdoor fermentation with natural temperature variation produces deep color, complex flavor, and high amino acid content (50-100x higher than regular rice vinegar). Associated with Kagoshima Prefecture's Fukuyama town where ceramic jar fields create a distinctive landscape. Flavor is mellow, round, slightly sweet, and complex with less sharp acidity than standard rice vinegar. Used in health tonics (kuro-su drinks), dressings, and as a superior cooking vinegar. Completely different from Chinese black vinegar (Shanxi vinegar uses sorghum).