Tepachi Fermentation Japanese Vinegar Rice Su

Japan — rice vinegar production tradition over 1,000 years; Mitsukan Handa, Aichi as primary modern production center since Edo period

Komezu (Japanese rice vinegar) is the mildest, most delicately flavored member of the global vinegar family — produced through two-stage fermentation of rice (first alcohol fermentation with yeast, then acetic acid fermentation with Acetobacter bacteria) that creates a vinegar with approximately 4-5% acidity, pale golden color, and a distinctively clean, mildly fruity, slightly sweet character that makes it indispensable for sushi rice seasoning, sunomono (vinegar salad), and ponzu construction. The specific character of komezu derives from its substrate: rice starch's specific sugars, the residual amino acids from protein breakdown during fermentation, and the relatively short Acetobacter fermentation period compared to wine or cider vinegars produce a rounder, less astringent acidity. Premium artisan komezu from producers such as Mitsukan (which dominates commercial production) and smaller artisan producers in Yamaguchi and Kagoshima uses higher rice ratios and longer secondary fermentation for greater complexity. Awasezu (seasoned sushi vinegar) combines komezu with sugar and salt, pre-mixed for sushi rice efficiency. Beyond rice vinegar, Japanese cooking also employs kuro su (black vinegar, aged rice vinegar from Kagoshima) which has a distinctly richer, darker, wine-adjacent character suitable for braised preparations and health drink formulations.

Clean, mild, and slightly sweet with a gentle fruity note; the least aggressive member of the vinegar family; its restraint is the point — it seasons without announcing itself, which is precisely what sushi rice requires