PURPOSE: To provide sugared vinegar which is good for the health and increases its acidity with time by the living yeast existing in the vinegar.

CONSTITUTION: A mixture of (A) 180 l of water, (B) 20 kg of muscovado, and (C) malted rice prepared from 20 kg of rice, is charged in a 200 l enameled tank, and stirred once a day for 5W6 days to obtain mixture having sweet taste. The mixture becomes bitter after storing 10 days in summer or 2 weeks in winter. The mixture of that stage contains about 15% of alcohol. Further storage of the mixture reduces the bitter taste and increases the acidity. After 25 days from the charge, the smell of the malted rice vanishes, and after 40 days, the natural vinegar having an acidity of ≥4.3% is prepared.