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THE MASH
They first mix steamed glutinous rice (Taiwan-grown!), wheatgrass (sprouted in-house), and water into a mash and ferment it anaerobically for two weeks. The wheatgrass enzymes and naturally-occuring yeast convert the starches into alcohol.

ACETIC ACID
Next, the workers at Wu Yin move the liquids into a new terracotta vat, introduce a starter culture of acetic acid bacteria, and let it ferment for 8 months until no alcohol remains. Wu Yin has been using the same bacteria culture for over 100 years.

RICE VINEGAR
After fermentation is complete, the vinegars are processed into a wide range of vinegar products. To make their classic seasoned rice vinegar, the workers at Wu Yin simply salt the brew.

TAIWANESE BLACK VINEGAR
Making Taiwanese-style black vinegar is a bit more complex. It’s made by mixing matured fruit vinegars, black vinegar, and white vinegar, then seasoning it according to a heritage recipe.