Traditional Beet Kvass

Ingredients

• 1.5 lb beets (scrubbed, cut into 1-inch cubes (no need to peel))
• 2 slices rye bread (preferably sourdough or dark rye, cut into 1-inch cubes)
• 8 cup water (filtered or dechlorinated (chlorine inhibits fermentation))
• 1 tbsp salt (non-iodized sea salt or kosher salt)

Instructions

1. 1

   Combine the water and salt in a large glass jar (at least 2 quarts). Stir until the salt dissolves completely. This brine creates an environment where beneficial lactobacillus thrives while harmful bacteria cannot.

2. 2

   Add the beet cubes and rye bread pieces to the brine. Stir gently to distribute them evenly. The bread acts as a fermentation starter, introducing wild yeasts and bacteria that will drive the fermentation.

3. 3

   Cover the jar loosely with a clean cloth or coffee filter secured with a rubber band—do not seal it tightly. The fermentation produces CO₂ that must escape, and the cloth prevents dust and insects from entering while allowing air exchange.

4. 4

   Place the jar in a cool, dark spot (65–72°F is ideal; avoid direct sunlight and heat). Over 3–5 days, the liquid will gradually turn deep red and develop a tangy aroma. Taste it daily starting on day 3: it should taste earthy, slightly sweet, and pleasantly sour—not vinegary.

5. 5

   Once the kvass reaches your desired tanginess (usually by day 4–5), strain it through a fine-mesh sieve or cheesecloth into a clean glass bottle, discarding the solids. The liquid should be clear and deep crimson.

6. 6

   Seal the bottle and refrigerate. The cold slows fermentation dramatically, preserving the kvass for 2–3 weeks. Serve chilled in small glasses (4–6 oz portions) as a digestive tonic or mixer. The flavor deepens slightly as it ages in the fridge.

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