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1
Roast the bird at high heat until the flesh is just firmed and the skin is coloured but the interior remains rare — a partridge will take approximately 12–15 minutes, a pheasant 18–22 minutes, a woodcock 10–12 minutes. Remove from the oven and reserve all roasting juices. For woodcock, the trail remains inside throughout this stage. The test: a skewer pressed into the thickest part of the breast meets only slight resistance and the juices run deep pink.
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2
Rest the bird briefly, then disjoint it cleanly: remove the legs and breasts as portions and set aside. Chop the carcass and all trimmings into small pieces with a heavy knife or cleaver. For woodcock, carefully extract the trail, push it through a fine sieve, and reserve the resulting purée aside from the heat. The carcass pieces should be small enough to colour rapidly and surrender flavour completely.
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3
Melt 30 g of the butter in a wide, heavy saucepan over high heat. Add the chopped carcass and trimmings, the shallots, and the mirepoix. Sauté, stirring frequently, until everything is deeply coloured — the fond on the pan base should be mahogany, not pale. The test: the smell shifts from raw butter and raw bone to a concentrated roasted-game aroma.
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4
This is where the dish lives or dies. Deglaze the pan with the wine (and Armagnac if using), scraping every particle of fond from the base. Add the demi-glace and the reserved roasting juices. Bring to a simmer and maintain it, uncovered, for 30 minutes — the liquid should reduce steadily and the colour deepen. The carcass must give everything it holds to this liquid; insufficient time here and the sauce will taste of wine and stock rather than of the specific bird.
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5
Strain the sauce through a fine chinois into a clean saucepan, pressing the carcass fragments firmly and repeatedly with the back of a ladle to extract every drop of flavour. Discard the spent solids. The test: the strained liquid should be wine-dark and noticeably viscous, not watery.
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6
Return the strained sauce to medium heat and reduce to nappante consistency — the sauce should coat the back of a spoon and a line drawn through it holds cleanly. Taste and correct seasoning with salt and white pepper. For woodcock salmis, remove the pan from the heat and whisk in the sieved trail off the heat, in the manner of mounting with butter. The test: the sauce coats the spoon with a mirror-like surface and the flavour reads unmistakably of the bird species used.
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7
Lower the heat to the gentlest simmer. Lay the reserved bird portions into the sauce and allow them to finish cooking in it — they are not reheated aggressively but rather drawn slowly to temperature. The portions are ready when they yield to gentle pressure and the juices at the joint run clear pink to clear. Serve immediately on warmed plates; for woodcock salmis, place a croûton spread with the trail beneath each portion.