PURPOSE: To prepare a brewed vinegar containing natural potassium and having the taste, flavor and palatability suitable not only as a seasoning but also as a drink, by using squeezed sugar cane juice or roughly refined sugar as a raw material.

CONSTITUTION: A mixture composed of squeezed sugar cane syrup and/or roughly refined sugar, tangle, red KOJI (aspergillus) and yellow KOJI is fermented with cultured liquid of yeast and seed vinegar by conventional method, and the fermentation is terminated when the acidity reaches 5W6%. The obtained product is refined by conventional process.