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1
Prepare a brine of 80 g fine sea salt and 15 g Prague Powder #1 per litre of cold water — sufficient to submerge the head halves fully. Immerse the head, cover, and hold at 2–4°C for 48–72 hours. The brine develops colour, seasons the flesh to the bone, and inhibits Clostridium botulinum. The cure is complete when the deepest muscle shows an even, faintly rosy hue with no grey centre.
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2
Remove the head from the brine and rinse thoroughly under cold running water. Toast the peppercorns and cloves briefly in a dry pan until fragrant, then add to a large braising vessel with the onion piqué and bouquet garni. Place the head halves in the vessel and cover with cold water. Raise the temperature slowly to 85–90°C and maintain a gentle, trembling simmer — never a boil. The liquor should remain pale and translucent; any aggressive bubbling clouds it irreversibly and toughens the meat.
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3
Hold at 85–90°C for 3–4 hours. This is where the dish lives or dies: too high a temperature seizes the proteins and yields stringy, dry meat; too low, and the collagen will not fully dissolve into the liquor. The braise is done when the meat pulls cleanly and without resistance from the skull and jawbone, and the skin yields to gentle finger pressure.
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4
Lift the head halves from the vessel and set aside to cool until handleable. Strain the cooking liquor through cheesecloth into a wide saucepan and reduce by half over a moderate heat. To verify gel strength, pour 100 ml into a ramekin and refrigerate; it should set firmly within 2 hours. The reduced liquor should smell clean, deeply savoury, and faintly porky.
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5
Hand-shred or coarsely chop the meat, ears, tongue, and skin. Reserve the tongue and dice it separately for visual contrast in the cross-section. Discard all cartilage fragments and bone. The pulled texture — varied in strand length and thickness — is essential; do not machine-process to a uniform paste.
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6
In a large bowl, combine the shredded meat with 15 g Dijon mustard, 20 ml white wine vinegar, the chopped parsley, cornichon brunoise, and shallots per kg of meat. Season assertively with fine sea salt and freshly cracked black pepper. Fold in 300–400 ml of warm reduced liquor per kg until the mixture is thoroughly bound and glistens. Taste: the seasoning should be pronounced — the set terrine will be served cold, which mutes flavour.
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7
Line a terrine mould with plastic film. Pack the seasoned meat firmly and evenly, distributing the diced tongue throughout for a mosaic cross-section. Fold the plastic over the surface, place a 1 kg weight on top, and refrigerate at 2–4°C for 12–24 hours. The terrine is set when it holds a clean, firm shape upon unmoulding and does not slump. Allow 24–48 hours of maturation before slicing for optimal flavour integration.
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8
Unmould and slice 8–10 mm thick with a sharp, thin-bladed knife. Each slice should reveal a compact, glossy matrix of meat and amber jelly with no crumbling at the edges. Serve with grain mustard and pickled vegetables.