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1
Bring separate large pots of seasoned broth — each containing aromatics, salt, peppercorns, and bay leaves — to a simmer before any meat is added. The broth must already be trembling before the first component enters the pot. This is where the dish lives or dies: meat lowered into already-simmering broth seals at the surface, retaining flavour within the flesh; cold water draws flavour out into the liquid and makes better stock but lesser bollito. The meat is the priority here, not the broth.
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2
Lower the beef brisket into one pot of simmering broth. Stagger the starts of the tongue and cotechino so that all components finish simultaneously: beef brisket and tongue require 2.5–3 hours; cotechino requires 2 hours. Reduce heat immediately to maintain 85–90°C throughout. The surface of the broth should tremble but must not actively bubble at any point during cooking.
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3
After 1 hour, lower the cotechino into its own pot of simmering broth at the same maintained temperature of 85–90°C. Do not allow the broth to return to a full boil. The surface should continue to tremble gently.
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4
After 1.5 hours from the start, lower the trussed chicken and the veal into their own pots of simmering broth. Maintain 85–90°C. The chicken requires 1.5 hours. All components should now be timed to finish at the same moment.
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5
Test each component for doneness by piercing with a skewer at its thickest point: the juices should run clear and the flesh should yield without resistance. Do not remove from the broth. Rest all components submerged in their respective broths until the moment of service; the broth keeps the meat moist and continues to flavour it gently.
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6
To serve, lift each component from its broth, slice, and arrange together on a large warm serving platter. The broth from any or all of the pots may be passed separately as a first-course broth or reserved for subsequent cooking. Place salsa verde, mostarda di Cremona, and gremolata on the table at room temperature alongside the platter.