Borscht (Beet Soup)

Variations

• What the vinegar is actually doing. Šaltibarščiai quotes this page's tip and adds that it "does not say why". The answer is in the pigment. The red is betanin, and at neutral or alkaline pH heat and time break it down to brown, while in acid it holds up far longer. So the vinegar has a job at the moment the beets cook that is separate from the seasoning you adjust at the end.
• Not every red pigment answers acid the same way. The shiso in umeboshi and the anthocyanins in red velvet cake change colour in acid — they go bright red. Betanin does not change colour; it is simply protected from breaking down. Two pigments, two different relationships with the same acid.
• Cooking the beets separately and adding them late is the same story. Betanin is water-soluble as well as heat-sensitive, so the longer the beets sit in the pot the more colour leaves the vegetable for the liquid and breaks down there. Cooking them apart and adding them at the end splits one long exposure into two short ones.
• Vegetarian borscht: Skip the meat and use vegetable stock — also a Lenten dish.
• With pampushky: Serve with garlic bread rolls.
• With beans: Add white beans for a heartier pot.
• Cold borscht: In summer it's sometimes served chilled. Lithuania's šaltibarščiai is a separate dish rather than this one chilled — raw kefir, no broth and nothing cooked together.

Tips

• Add the vinegar/lemon while cooking the beets to lock in the vivid red (skip it and it turns dull).
• Cook the beets separately and add them late to keep their color and sweetness.
• The sweet-sour-salty balance is everything — adjust vinegar, sugar, and salt to taste.
• Resting after cooking lets the flavors meld and deepen.
• It's even better reheated the next day — a day's rest is recommended.
• The sweetness is already in the pot. Beetroot is around 8% sugar by weight, so the broth is sweet before any sugar is added. The axis you are really adjusting is the acid — how much vinegar goes in decides whether that sweetness is held in check. Reach for the vinegar before the sugar (balancing flavour).
• "Better the next day" is not special to this dish. Most of the stews on this site say it (braising). What is particular here is the cost: betanin goes on breaking down through the reheating, so the flavour deepens while the colour fades. Holding back some of the beetroot and stirring it in after reheating gets both.