Poulet au Vin Jaune et Morilles

The dish belongs to the Jura and the wider Franche-Comté, and assembles the region's prize products: morels gathered in the Jurassien forests, cream and butter from the Comté dairy country, and above all vin jaune. That oxidative yellow wine is made only from Savagnin in four Jura appellations and is matured in part-filled barrels, never topped up, for a legal minimum of six years and three months under a yeast veil (the voile); it is bottled in the squat 62 cl clavelin, the volume left after evaporation. Its most prestigious source is the Château-Chalon AOC, created in 1936 and dedicated solely to vin jaune. The classic bird is the Poulet de Bresse, which in 1957 became the first poultry granted an AOC and is now the only chicken with European AOP protection; the Bresse zone reaches into the Jura département, so wine and bird share a terroir. The exact origin of the recipe is unrecorded — it is regional household and festive cooking rather than a chef's invention.

Tender chicken under a thick, ivory sauce that tastes savoury and deep before it tastes of wine — a warm note between toasted walnut and curry spice that no other wine gives. The morels are dark and spongy, meaty rather than slippery, and soak up the sauce like little reservoirs. Bresse meat is firm and full-flavoured and should stay juicy, pulling cleanly from the bone. The sauce should nap a spoon; the vin jaune note is distinctive but should not turn sharp or bitter.

The whole dish turns on what oxidative aging does to the wine. Under the voile — a film of Saccharomyces cerevisiae, thinner and patchier than the flor of fino sherry, so some oxygen still gets in — the Savagnin slowly builds sotolon, a lactone (formed from alpha-ketobutyric acid) that smells of fenugreek, curry, and roasted walnut and reaches very high levels in vin jaune. That compound, plus the wine's high acidity, is what brands the sauce. Reducing the wine concentrates the sotolon rather than boiling it away, since it is far less volatile than the aromatics in ordinary wine. Morels bring their own deep, meaty savour, partly from glutamate and from compounds developed when the wild mushrooms are dried, which rehydration and simmering draw back into the sauce. The cream is added gently and not boiled hard, because the wine's acidity can split it; a brief reduction then ties the fat, wine, and mushroom liquor into one glossy sauce.