Forestière is chasseur's wilder, more single-minded cousin — a sauce that celebrates the forest floor by building its entire identity around mushrooms. Where chasseur balances mushroom against tomato and tarragon, forestière lets the fungi speak alone, supported by shallot, demi-glace, and a finish of herbs. The mushroom selection is critical: this sauce demands a mixture of wild species for complexity. Cèpes (porcini) provide meaty depth, girolles (chanterelles) contribute apricot-like fragrance, pieds de mouton (hedgehog mushrooms) add a sweet nuttiness, and trompettes de la mort (black trumpets) bring an almost truffle-like intensity. In the absence of wild mushrooms, quality cultivated varieties — cremini, king oyster, maitake — can substitute but will never replicate the depth of a true forestière. The mushrooms are sautéed in clarified butter over high heat in batches to achieve proper caramelisation, then removed. Shallots are sweated in the same pan, white wine is added and reduced by half, demi-glace follows for a 10-minute simmer, and the mushrooms are returned. Chopped flat-leaf parsley is the traditional herb finish — its clean, green note lifts the earthiness without competing. The sauce should be thick with visible mushroom pieces, dark from the demi-glace, and taste unmistakably of the forest.
Wild mushroom mixture is ideal — cèpes, girolles, pieds de mouton, trompettes. Sauté in batches over high heat — never crowd the pan. White wine reduced by half provides acid balance. Demi-glace for body and richness. Parsley finish — clean and green against the earthiness.
Rehydrate a handful of dried cèpes in warm water for 30 minutes and add both the mushrooms and the strained soaking liquid to the sauce — this deepens the umami intensity significantly. For the most dramatic presentation, sauté a few whole small girolles and use them as a garnish on top of the sauce at service. A splash of Madeira instead of white wine transforms the sauce from good to extraordinary.
Using only one type of mushroom — complexity requires variety. Crowding the pan — mushrooms steam instead of sautéing, losing both colour and flavour. Adding cream — forestière is not a cream sauce; it relies on demi-glace for body. Over-seasoning with truffle oil — if you want truffle, use real truffle.
Escoffier, Le Guide Culinaire; Larousse Gastronomique