
Beet kvass is one of those ancient fermented tonics that feels almost magical — raw beets, salt, a splash of apple cider vinegar, and a little patience transform into a deeply ruby, tangy drink that's earthy, bright, and genuinely good for you. The grated ginger adds a gentle warmth that keeps each sip interesting, and the optional thyme brings a subtle herbal note that makes the whole thing feel a bit more refined. There are no nuts, no nut-derived ingredients, and no complex processing involved — just whole vegetables and a simple countertop ferment, so you know exactly what's in your glass. The hardest part is honestly waiting the two to three days while the liquid deepens in color and develops that pleasantly tart edge. Once it's strained and chilled, it's best served in small glasses — it's a sipping tonic, not a chug — and it keeps in the fridge for up to a week. If you've been curious about fermentation but intimidated by the process, this is the perfect low-stakes starting point.
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Place the cubed beets into a clean 1-quart wide-mouth glass jar. Add the sea salt, apple cider vinegar, and grated ginger. Tuck in the thyme sprigs, if using.
Pour the filtered water over the beets, leaving at least 1 inch of headspace at the top of the jar. The beets should be fully submerged; press them down gently if any float above the waterline.
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