Beet kvass
Before lemons and vinegar were easy to buy, Ukrainian cooks soured their borscht with beet kvass, a ruby-red brine made by leaving sliced raw beetroot in salted water for a few days. It is lightly fermented, so it contains no more than a negligible trace of alcohol, and it tastes earthy, salty and pleasantly sharp. In Poltava and Chernihiv villages a jar always stood by the stove; a splash went into the soup pot and a small glass was drunk in the morning as a tonic. Some families add a crust of rye bread to speed things up, which makes it no longer gluten-free. The mistake most people make is leaving the beetroot floating: anything above the brine can grow mould, so keep it weighed down. Discard any batch with fuzzy or coloured mould, a slimy texture or a rotten smell. Chef's tip: a few slices left in the jar from the previous batch start the next one in half the time.
































































































