Confit de canard is the foundational preservation technique of Gascony, in which whole duck legs — comprising the drumstick and thigh of the Moulard or Barbary duck (Cairina moschata) — are cured in a mixture of 30 g coarse sea salt per kilogram, cracked black pepper, crushed garlic (Allium sativum), and fresh thyme (Thymus vulgaris) for 24 to 48 hours under refrigeration. The cure extracts surface moisture through osmotic pressure, inhibiting microbial growth while flavoring the meat. After curing, excess salt is rinsed away and the legs are slowly submerged in rendered duck fat at a controlled temperature of 85-95°C (185-203°F) for 2.5 to 4 hours. This sub-boiling poach is critical: at this range, collagen in the periosteum and intermuscular fascia converts to gelatin without the violent agitation of a boil, which would shred the muscle fibers prematurely. The internal temperature should stabilize at 82°C for a minimum of 60 minutes. Once tender — a skewer should pass through the thickest point with no resistance — the legs are carefully transferred to sterilized stoneware crocks or Weck jars and completely submerged in strained cooking fat. Properly sealed confit, stored at 2-4°C with no air pockets, will preserve for 6 months or longer, as the fat seal creates an anaerobic environment hostile to Clostridium and aerobic spoilage organisms. To serve, the legs are removed from fat, patted dry, and crisped skin-side down in a heavy skillet at 200°C (390°F) or in an oven until the skin is golden and shattering. The meat beneath remains succulent and deeply flavored from the cure and slow fat-poach.
{"Cure for 24-48 hours with 30 g salt per kg to extract moisture and season the meat through osmotic pressure","Poach at 85-95°C — never boil — to convert collagen without destroying muscle fiber integrity","Submerge completely in fat with no air pockets to ensure anaerobic preservation","Store at 2-4°C; properly sealed confit holds for up to 6 months","Crisp skin-side down in a hot pan or oven before serving to restore textural contrast"}
{"Save and reuse confit fat for up to 3 cycles — it gains flavor with each use, like a sourdough starter of fat","Add a single star anise and a strip of dried orange peel to the cure for a Gascon-modern aromatic twist","For cassoulet, confit the legs 2 weeks ahead; the resting period deepens flavor integration markedly","Score the skin in a crosshatch pattern before crisping to maximize surface area and render subcutaneous fat evenly"}
{"Under-curing, which leaves the meat bland and reduces preservation efficacy","Cooking at too high a temperature, causing the meat to dry out despite fat submersion","Leaving air pockets in the storage vessel, which permits aerobic bacterial growth and spoilage","Failing to rinse excess cure salt before cooking, resulting in aggressively salty confit","Storing in fat that was not strained of protein particles, which accelerate rancidity"}
Escoffier, Le Guide Culinaire; Larousse Gastronomique; Wolfert, The Cooking of Southwest France