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1
Fill a pot of at least 20 litres with cold water and bring it to a vigorous boil with the onion, carrot, celery, and peppercorns. Meanwhile, bring a separate, smaller pot of water to the boil for the cotechino and zampone. These two are cooked apart throughout; their fat would cloud the main broth irreparably. The main broth base is ready when the vegetables have coloured the water lightly and the liquid boils steadily.
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2
Lower the heat on the main pot until the liquid holds a bare simmer — visible movement at the surface but no rolling boil; 80–85 °C is the target. This is the condition that must be maintained without interruption for the entire cooking. Add the tongue first: it requires 2–3 hours. Lower it into the simmering water. In the separate pot, set the cotechino and zampone to their own gentle simmer; they require 2 hours. Skim both pots frequently and thoroughly for the first 30 minutes of each addition. The surface of the main broth is clean when no further grey foam rises.
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3
After 30 minutes, add the brisket to the main pot; it requires 2–2.5 hours. After a further 30 minutes, add the testina; it requires approximately 2 hours. Continue to skim as needed. The liquid must never boil: a rolling boil toughens the protein fibres, produces grey and stringy meat, and is the single error from which the dish cannot recover. This is where the bollito lives or dies — the simmer must be policed at every stage, not merely at the start. The correct state is a surface that trembles rather than churns.
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4
After the brisket has been in for 30 minutes (1 hour after tongue), add the capon and the cappone; the capon requires approximately 1.5 hours, the cappone similarly. Adjust the intervals as the actual weight of each bird dictates. The staggered sequence is the principal challenge of the dish: all cuts must arrive at tenderness simultaneously. Test each piece by pressing with a fork — the meat must yield without resistance but must not fall apart. Remove each piece the moment it passes this test and keep it covered on a warm platter with a ladle of broth spooned over to prevent drying.
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5
The tongue must be peeled immediately upon removal from the pot, while it is still too hot to handle comfortably. Work quickly: grasp the skin at the base and pull it away in strips. If the tongue cools before peeling, the skin bonds to the flesh and cannot be removed cleanly. Once peeled, return the tongue to the warm platter under its ladle of broth. The skin should peel in clean, continuous strips from a properly cooked, immediately handled tongue.
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6
Prepare the salsa verde: combine the finely chopped parsley, capers, and anchovies. Work in the bread, squeezed thoroughly dry of vinegar. Add the oil gradually, stirring to a coarse, cohesive paste; finish with the red wine vinegar. The sauce should hold together without being smooth — it is a condiment, not a purée. Prepare the salsa di cren by combining grated horseradish with white wine vinegar and a small quantity of sugar to balance. Both sauces should be sharp, distinct in flavour, and ready before carving begins.
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7
Carve at the table onto a warmed platter. Each meat is sliced across the grain; slices must be thin — thick slices resist the sauces and diminish the dish. Arrange each meat separately so that the variety is legible on the platter. Serve with salsa verde, salsa di cren, and the mostarda alongside. Reserve the broth: it is, as the Emilian tradition holds, liquid gold, and becomes the brodo for tortellini. The finished platter presents each cut distinct in colour, texture, and character; the whole is greater than its parts.