Kvass

Russian Rye Kvass (Homemade)

A traditional fermented Slavic beverage made from stale rye bread, water, sugar and yeast. Naturally fizzy, mildly tangy, and only faintly alcoholic, kvass is the classic Russian summer thirst-quencher.

Prep

30 min

Cook

1440 min

Total

1470 min

Serves

8 (makes about 3 L / 3 quarts)

Difficulty

Easy

Recipe ingredients

• •500 g (1 lb 2 oz) stale rye bread, no seeds or caraway; ideally 2–3 days old, dried in the oven
• •3.5 L (3.7 quarts) boiled then cooled water, cooled to about 40 °C / 105 °F; do not use chlorinated tap water directly
• •200 g (1 cup) granulated sugar, divided use; plus extra for bottling if desired
• •5 g (2 tsp) dry active baker's yeast, or 15 g / ½ oz fresh compressed yeast; traditional recipes often use a 'wild' starter from the bread itself
• •30 g (¼ cup) raisins, untreated, no sulfites; a few per bottle for natural carbonation
• •1 L (4 cups) extra boiled water, for the second pour; cooled to 40 °C / 105 °F

Steps

1. 1 Crumble or tear the stale rye bread into rough 2 cm pieces. Spread on a tray and dry at 120 °C (250 °F) for 20–30 minutes until deep brown but not burnt; the Maillard crust is the main source of color and flavor.
2. 2 Optional but traditional: soak 50 g of the dried crusts in 200 ml of the warm water for 6–8 hours to build a wild starter. This step is skipped in many home recipes that rely on baker's yeast.
3. 3 Pour 3.5 L of warm (40 °C / 105 °F) boiled water over the remaining dried bread in a large glass or food-grade plastic jar. Stir in 100 g of the sugar. Cover loosely with cheesecloth and let steep for 4–6 hours at room temperature.
4. 4 Strain the liquid through a fine sieve, gently pressing the bread to extract flavor. Discard the soggy bread (or reserve for a thinner second batch — see Step 8).
5. 5 Dissolve the yeast and the remaining 100 g of sugar in a small amount of the warm strained liquid and let it foam for 10 minutes, then stir it back into the main batch.
6. 6 Cover loosely and ferment at 20–24 °C (68–75 °F) for 18–24 hours. The kvass is ready when it smells yeasty-bready, has a thin layer of foam, and tastes pleasantly tangy; it should feel lightly effervescent when stirred.
7. 7 Bottle: add 3–4 raisins to each clean plastic screw-cap bottle (glass is risky as kvass is actively carbonating). Funnel the kvass in, leaving about 3 cm of headspace. Seal loosely for the first 6 hours, then tighten.
8. 8 Second pour (traditional, lighter): return the used bread to the jar, add the remaining 1 L of warm boiled water, 50 g sugar, and ferment again for 12–18 hours. Strain and bottle as above. The result is thinner and more sour.
9. 9 Cold-mature the sealed bottles at 4–8 °C (39–46 °F) for 24–48 hours to develop natural carbonation. Doneness cue: bottles feel firm when squeezed and a gentle shake produces a hiss on opening. If bottles become rock-hard, release the cap briefly to vent, then re-seal.
10. 10 Serve very cold, straight from the bottle or poured over ice. Keep refrigerated and consume within 5–7 days. Natural alcohol content is typically 0.5–1.2% ABV — this is a traditional fermented beverage, not a soft drink, and is not recommended for children or those avoiding alcohol.