Preparation

Kvass traditionally uses stale rye bread as its fermentation base, but the method works beautifully with fruit and vegetables. Wild fermentation means you're relying on naturally present yeasts and bacteria rather than commercial cultures — the process is unpredictable, slightly risky, and produces unique results every time. That's the beauty of it.

Preparation

1. Thoroughly clean a half-gallon glass jar. Do not sterilize it — you want the ambient microorganisms.
2. Place rhubarb and ginger in the jar. Dissolve honey and salt in the filtered water (warm slightly if needed, but let cool to room temperature before using).
3. Pour the sweetened water over the rhubarb and ginger. Add lemon juice. The liquid should cover the rhubarb completely; weigh down with a small jar or fermentation weight if needed.
4. Cover with a cloth secured with a rubber band. Place in a warm spot out of direct sunlight.
5. Stir daily with a clean wooden spoon. Within 2-3 days, you should see bubbles forming. Taste it — it should become progressively tangier and slightly fizzy.
6. After 4-6 days, when it reaches a tartness you enjoy and has noticeable effervescence, strain out the solids.
7. Transfer the liquid to bottles with tight caps and refrigerate. The cold slows fermentation but doesn't stop it — the kvass will continue developing flavor and carbonation.
8. Burp the bottles daily for the first few days to prevent over-carbonation. Drink within 2 weeks.

Warning: Wild fermentation can occasionally produce off-flavors or spoilage. If it smells rotten (not just funky), develops mold, or tastes wrong, discard and start over.