Kvass is a traditional fermented Slavic and Baltic beverage commonly made from rye bread, which is known in many Central and Eastern European and Asian countries as "black bread". The colour of the bread used contributes to the colour of the resulting drink. Kvass's alcohol content from fermentation is typically low (0.5–1.0% or 1–2 proof). It may be flavoured with fruits such as strawberries or raisins, or with herbs such as mint. Kvass is especially popular in Russia.
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