If you want authentic, bright, and tangy flavor in your Polish beet borscht (especially the meatless Barszcz Postny), you need Beet Kvas — a simple fermented beet juice that serves as the soul of the soup.
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This quick version uses cooked beets and a splash of vinegar for a shortcut that still delivers the classic tangy depth without waiting weeks for full fermentation. It’s the perfect base for traditional red borscht and adds a beautiful ruby color and bright acidity that balances the earthy sweetness of beets.
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Makes about 4 cups (1 liter) — enough for a big pot of soup with some left over.
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Kvas is the base for your soup. This one is used for Beet Borscht
Makes about 4 cups/1 liter
5-6 cups/1.2- 1.4 liters water
3 cooked beets, sliced
½ cup/125ml vinegar
Pour boiling water over the beets. Add vinegar and let stand at room temperature 2-4 days. Drain off juice and use as a base for soup.
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