Żurek (Sour Rye Soup with White Sausage and Egg)

// SUPPLY LIST

// OPERATIONS

1. 1 Five days ahead, make the zakwas: scald a 1.5 litre glass jar and a wooden spoon with boiling water and dry them, then whisk the 100 g wholegrain rye flour into 600 ml water that has been boiled and cooled to 35-40°C (95-104°F) until there is not one lump left. Stir in 5 crushed garlic cloves, 2 bay leaves and 6 allspice berries, cover the mouth with muslin or a doubled cloth under a rubber band — never a sealed lid, which traps the gas the ferment makes and can burst the jar — and stand it at 20-24°C (68-75°F) out of direct sun.
2. 2 Stir the zakwas once a day with the scalded spoon. By day two it should fizz faintly at the rim and smell of raw bread dough; by day five the flour should have dropped into a chalky white sediment under a translucent grey-amber liquid that smells of sourdough, garlic and cucumber pickle brine, and tastes cleanly, aggressively sour with no bitterness behind it. A thin white film on top is kahm yeast and is harmless — skim it and carry on — but fuzzy green, pink or black growth, or a smell of acetone or drains, means throw it out and start again. Do not shortcut this with vinegar or lemon juice: acetic and citric acid are flat and one-dimensional against the rounded lactic sourness of rye, and the ferment is the dish. Bottled zakwas from a Polish shop is genuinely common in Polish home kitchens and will make a respectable soup, but a duller one.
3. 3 On the day, char the onion halves cut-side down in a dry heavy frying pan over high heat for 3-4 minutes, until the cut faces are properly black rather than golden — this is where the broth's colour comes from. Put the smoked ribs into a 5 litre heavy stockpot with 2.5 litres cold water and bring slowly up to 90°C/194°F over medium heat, about 20 minutes, skimming off the grey scum as it rises; add the charred onion, 2 bay leaves, 4 allspice berries and the peppercorns and hold at a bare shiver, one bubble breaking every second or two, for 90 minutes. Never let it boil — a rolling boil emulsifies the rib fat into the liquid and you will not get a clean-tasting broth back.
4. 4 Add the carrot, parsley root, celeriac and leek for the last 40 minutes only, then lift out the ribs and strain the broth through a fine sieve lined with muslin into a clean pot of at least 4 litres — the rinsed-out stockpot is ideal, since everything else goes back into it — discarding the vegetables, which have given everything they have. Pull the meat off the ribs, shred it coarsely and reserve it somewhere warm. You should have about 1.8 litres — top up with water if you are short, or reduce it uncovered if you have much more, because the zakwas is dosed against this volume.
5. 5 Bring the strained broth to 80°C/176°F (steaming, no bubbles at all) and slide in the whole biała kiełbasa; poach for 25 minutes, until an instant-read thermometer in the thickest link reads 72°C/162°F and the sausages have turned from pink-grey to opaque pale ivory and firmed up. Do not prick them and do not let the pot boil: either one splits the casings, and the fat and stuffing that escape will leave the soup greasy and muddy. Lift them onto a board, rest 5 minutes, then cut into 1.5 cm coins and keep them covered and warm with the shredded rib meat — they go back into the pot cold otherwise and pull the finished soup below serving temperature.
6. 6 Meanwhile lower the 6 room-temperature eggs into a pan of boiling water and cook exactly 9 minutes for yolks set to the edge and dense but still bright, then move them straight into iced water for 3 minutes before peeling and halving lengthways — that is one whole egg, two halves, per bowl. In a second pan start the potatoes in cold water salted at 10 g per litre, bring to the boil and cook 18-20 minutes from the boil, until a knife point slides through the centre with no resistance; drain and keep warm.
7. 7 Put the diced bacon into a cold dry frying pan and set it over medium-low heat for 8-10 minutes, stirring now and then, until the fat has run clear and the pieces are amber and crisp at the edges but not hard, then tip bacon and rendered fat together into the broth pot. Starting from a cold pan matters — a hot pan seizes the outside of the dice and the fat stays locked inside them.
8. 8 Shake or stir the zakwas hard so the settled sediment goes back into suspension — that sediment carries the body and most of the flavour, and pouring off only the clear liquid gives a thin, shrill soup — then pour 450 ml of it into the broth in a steady stream through a coarse sieve set over the pot, which catches the garlic, bay and allspice while letting all the cloudy flour through, whisking constantly as it goes. Hold the soup uncovered at 88-92°C (190-198°F) for 12 minutes so the raw floury edge cooks out; from this point it must never boil, because boiling flattens the sour aroma and can break the starch so the soup turns grainy.
9. 9 Take the pot off the heat and rub 1 1/2 tbsp of the dried marjoram between your palms straight into the soup, keeping the remaining 1/2 tbsp back for the table — crushing it that way releases the oils, and żurek wants far more marjoram than seems reasonable — then stir in the grated raw garlic and the fresh horseradish. Adding these off the heat is deliberate: both lose their volatile bite within a minute of simmering and the soup goes blunt.
10. 10 Whisk 3 or 4 ladles of the hot soup into the cream in a separate bowl, one ladle at a time, until the cream is hot to the touch, then pour it back into the pot off the heat and stir it through. Cold cream tipped straight into a hot acidic soup curdles into visible flecks, and no amount of whisking will bring it back together.
11. 11 Season only now: fold in the warm shredded rib meat and the sausage coins, then add salt in 2-3 g increments and several grinds of black pepper, tasting after each, because the smoked ribs, bacon and sausage have already salted the pot heavily. If it is fiercer than you want, loosen it with 100 ml hot water or a little more cream rather than sugar; if it tastes merely tangy, add zakwas 50 ml at a time until it makes you sit up. Cover with the lid ajar and rest off the heat for 10 minutes so the marjoram blooms and the acidity settles from spiky to round, then bring it back over low heat to 85°C/185°F — hot enough to steam, with no bubble anywhere — before it goes to the table.
12. 12 Serve very hot in wide bowls: potatoes in the bottom, soup poured over, then the sausage coins, one whole egg per person as two halves, the crisp bacon and a final pinch of the reserved marjoram rubbed between the fingers over the top, with more fresh horseradish grated at the table for whoever wants it. The Easter version goes into a hollowed-out round rye loaf instead of a bowl if you want it — buy one extra loaf per two people, leave the potatoes out, and serve the torn-out bread alongside for dipping. Leftovers reheat well the next day but only below a simmer — boil it and the cream splits.

// CLASSIFICATIONS