Salmis is the specific sauce for roast game birds — a preparation that transforms the carcass of a partially roasted bird into a rich, wine-dark sauce in which the bird's portions finish cooking. The technique is unique: the bird (woodcock, partridge, pheasant, or wild duck) is roasted to rare — just enough to firm the flesh for carving — then disjointed. The carcass and trimmings are chopped and sautéed in butter with shallots and mirepoix until deeply coloured, then deglazed with red or white wine (red for dark-fleshed game, white for lighter birds) and simmered with demi-glace for 30 minutes. The sauce is strained through a chinois, pressing the carcass fragments firmly to extract every drop of flavour. The strained sauce is reduced to nappante consistency and the bird portions are gently reheated in it — they finish cooking in the sauce itself, absorbing its flavour while contributing their juices. For woodcock — the most prized salmis — the intestines (trail) are left in during the initial roast and are later spread on croûtons that accompany the dish. The finished sauce should taste of the specific bird: partridge salmis should taste of partridge, not generic game. This specificity is what elevates salmis above ordinary game sauce. It is among the most sophisticated techniques in the saucier's repertoire because it treats the animal as both protein and sauce foundation simultaneously.
Partially roast the bird to rare — just enough for carving. Carcass chopped and sautéed for fond, then deglazed and simmered with demi-glace. Strain, pressing carcass firmly. Bird portions finish cooking IN the sauce. The sauce must taste of the specific bird species.
For the richest salmis, add a splash of the bird's roasting juices to the sauce just before the portions go in — this intensifies the species-specific character. If making woodcock salmis, the trail (intestines) should be pushed through a sieve and whisked into the sauce off heat — this is considered the ultimate refinement. A splash of Armagnac rather than Cognac gives the sauce a more rustic, gascony character that suits game birds.
Fully cooking the bird before making the sauce — the portions overcook when reheated in the sauce. Using generic game stock instead of the bird's own carcass — the species-specific flavour is lost. Under-pressing the carcass during straining — flavour remains trapped in the bones. Over-reducing — the sauce becomes too intense and overwhelms the delicate game flesh.
Escoffier, Le Guide Culinaire; Larousse Gastronomique; La Varenne, Le Cuisinier François