Chłodnik: The Cold Pink Beetroot Soup

There is a moment every July when I open the fridge, see a bag of beetroot I bought with vague good intentions, and remember that the best thing to do with them requires no oven and barely any heat. Chłodnik litewski — “little cold soup, Lithuanian-style” — is the answer to a Polish heatwave, and it is the most aggressively pink food I make all year. It arrives at the table the colour of a child’s felt-tip pen, and it tastes clean, sour, herbal and cold enough to reset your whole afternoon.

Where the pink soup comes from

The name gives away the argument. Chłodnik litewski means Lithuanian chłodnik, and the dish belongs to the shared kitchen of the old Polish-Lithuanian Commonwealth, that vast multi-ethnic state that ran from the Baltic down towards the Black Sea for the better part of three centuries. Cold soured-milk soups thickened with young beetroot and their leaves were a summer staple across the whole region — Polish, Lithuanian, Belarusian and Jewish households all had a version, and all of them argued that theirs was the original.

You can taste the family resemblance if you have ever had its Lithuanian cousin. The neon-pink šaltibarščiai is the same idea taken to a brighter extreme, served with a side of hot boiled potatoes rather than an egg in the bowl. The Polish version tends to be denser with vegetables and a little more restrained in colour — though “restrained” is relative when the finished soup could stop traffic.

What unites them is a peasant-clever bit of food science. Before refrigeration, soured milk was simply what happened to milk in warm weather, and cooks learned to build entire meals around it rather than fight it. Kefir and buttermilk are lactic-acid ferments: tangy, slightly effervescent, and already halfway to a chilled soup. Add cold beetroot for body and sweetness, raw cucumber and radish for crunch, and a fistful of dill, and you have a complete summer lunch that never touches a hot stove for longer than it takes to boil an egg.

The nineteenth-century Polish cookery writer Lucyna Ćwierczakiewiczowa — a household name in her day, the Mrs Beeton of Warsaw — recorded chłodnik with crayfish tails and veal, a grand version for grand tables. The everyday one in most Polish homes is humbler and better for it: beetroot, soured milk, garden vegetables, egg. That is the one I make.

The Jewish version deserves its own mention, because it travelled. Ashkenazi communities across Poland, Lithuania and Belarus made a cold beetroot soup — often called chlodnik or, in Yiddish, a cold borscht — as a summer staple, and when hundreds of thousands emigrated to America around the turn of the twentieth century they took it with them. The “cold borscht” sold in New York delicatessens and the Catskills resorts, drunk straight from the glass with a boiled potato dropped in, is a direct descendant of the same soured-milk soup. It is a small, pink thread connecting a Warsaw kitchen to a Brooklyn lunch counter, and it explains why so many people with roots in the region have a grandmother who made exactly this.

Getting the colour and the sourness right

Two small techniques separate a good chłodnik from a muddy, greyish disappointment.

The first is the beetroot stock. If you only use boiled beetroot, the soup goes a dull maroon and tastes flat. The trick is to grate a portion of raw beetroot and simmer it briefly with a splash of vinegar. The acid fixes the betalain pigments — the same compounds that stain your chopping board — and locks in that shocking magenta. Straining this into the soured milk gives you a base the colour of raspberry cordial before you have added a single cube of cooked beet.

The second is balance. Kefir and buttermilk are sour, beetroot is sweet and earthy, and the soup needs a nudge of both salt and extra acid to sing. I add a teaspoon of sugar to lean into the beetroot’s natural sweetness, then correct with vinegar or lemon at the end once the soup is cold — because chilling flattens flavour, and a soup seasoned warm will taste dull straight from the fridge. Always season cold soups cold.

Dill does structural work here. In this dish the herb is a load-bearing ingredient; the grassy, faintly aniseed note of fresh dill is half of what makes chłodnik taste the way it should. Use more than you think you need. If your dill is limp, chop the stems finely too — they carry as much flavour as the fronds.

A third detail worth getting right is the texture. Chłodnik should be a proper soup, spoonable and cohesive, rather than a thin pink liquid with vegetables loose in the bottom. The soured cream and the cooked beetroot both add body; if yours comes out watery, whisk in an extra spoon or two of śmietana. Some cooks grate a little of the cooked beetroot rather than dicing it all, which thickens the base and deepens the colour further. The vegetables should be finely and evenly diced — 5mm cubes — so every spoonful carries a bit of cucumber crunch, a bit of radish heat and a bit of soft beetroot, rather than one big lump of any single thing.

Making it, step by step

Start with the beetroot, because everything else is assembly. Boil two whole, unpeeled beets in salted water until tender — 40 to 45 minutes for medium ones — then slip the skins off under cold water and dice them small. Meanwhile grate the third beet raw and simmer the gratings with a little water and vinegar to draw out that vivid stock, then cool both.

Whisk the strained beetroot stock into the kefir, buttermilk and soured cream. You want a pourable, single-cream consistency; if it is too thick, loosen with cold water or more kefir. Now fold in the finely diced cucumber, radish, spring onion and a generous amount of chopped dill, then the cooked beetroot cubes last so they tint the whole bowl.

The single most important step is the one that requires patience. Chłodnik must be cold — fridge-cold, ideally overnight. Three hours is the minimum; a night is better. The vegetables shed a little liquid, the dill perfumes the whole pot, and the soured milk mellows from sharp to rounded. Serve it with a couple of ice cubes dropped straight in, and a halved boiled egg laid on top of each bowl. The rich, jammy yolk against the icy sour soup is the entire point.

Tips, swaps and things that go wrong

The colour bleeds everywhere. That is beetroot doing its job. Wear an apron, use a board you do not mind staining, and rinse pink hands with a little lemon juice and salt, which lifts the pigment.

It tastes flat. You have under-seasoned a cold dish. Add salt and acid a little at a time until it tastes bright rather than muddy. A cold soup needs firmer seasoning than a hot one.

No buttermilk? Use all kefir, or thin natural yoghurt with a little milk. In Poland maślanka (buttermilk) and zsiadłe mleko (clabbered milk) are both traditional; the goal is tang and pourability, so any cultured dairy works. For a lighter soup, lean on kefir; for a richer one, use more soured cream.

Make it heartier. Some cooks poach a little diced veal or add cooked crayfish or prawns for a more festive bowl, echoing Ćwierczakiewiczowa’s grand version. I usually keep it vegetarian and let the egg do the work.

Storage. Chłodnik keeps for two days covered in the fridge and arguably improves on day two, though the radish softens. Give it a good stir before serving as the beetroot settles. Do not freeze it — the soured milk splits.

What to serve it with

Chłodnik is a starter or a light lunch rather than a whole dinner. In Poland it usually comes with boiled new potatoes on the side, buttered and showered with dill, which you eat between spoonfuls of cold soup — the hot-and-cold contrast is deliberate and lovely. A slice of dark rye bread does the same job.

If you are cooking a bigger Polish spread, it sits nicely before something substantial like kotlet schabowy done properly or a plate of pierogi ruskie — the cold, sour opener sets up the rich main. And if you catch the beetroot bug, the same root turns up in the beetroot dumpling broth kubbeh soup further east, proof that the pink obsession runs a long way beyond Poland.

Make it the day before a hot afternoon. Pull it out when the kitchen is too warm to think, drop in the ice, lay on the egg, and understand why an entire region decided that soured milk in July was something to plan a meal around rather than an accident to throw away.