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Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Kvass is a low‑alcohol, sour fermented rye bread beverage produced by lactic acid bacteria and wild yeast.
Origin: Slavic peoples (17th century) — Eastern Europe
See full technique reference →During fermentation, the natural sugars in rye dough are converted by Lactobacillus plantarum and wild yeast into lactic acid, acetic acid, ethanol, and CO₂. The pH drops from ~6.0 to 4.5–5.0 while the alcohol content rises to 0.3–1.2 % ABV, giving kvass its characteristic sour, mildly alcoholic flavor.
Primary Reaction
Carbohydrate fermentation to lactic acid, ethanol, and CO₂ by lactic acid bacteria and yeast
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