Estofinado de l'Aveyron

Decazeville and the Lot valley, Aveyron — the landlocked Aveyron preparation of dried air-cured cod (stockfish, not salt-cured) with walnut oil, potato, and hard-boiled egg, brought inland via the Lot river trade route from the Bay of Biscay. The dried cod was carried by barge from Bordeaux to Entraygues-sur-Truyère and then by mule track to the mining towns of the Bassin de Decazeville. The Portuguese and Basque Atlantic salt cod trade — the Portuguese bacalhau tradition and the Basque-Breton dried cod fleet operating off Newfoundland and Norway — supplied the dried fish that arrived in Bordeaux as bacalao and klipfish, then moved inland to become the Aveyron's emblematic fish preparation, despite the region having no coastline.

Stockfish (dried, unsalted air-cured cod — Gadus morhua) is soaked in cold water for 5 days minimum, changing the water twice daily, until the fish is fully rehydrated. The rehydrated fish is poached gently in water for 20 minutes, then drained. The flesh is broken into large flakes, removing all bones and skin. Waxy potatoes (Solanum tuberosum — Charlotte or similar) are cooked separately, sliced hot. Hard-boiled Gallus gallus domesticus eggs are peeled and quartered. Allium sativum is crushed to a paste. The warm fish, warm potato, Allium sativum paste, flat-leaf parsley (Petroselinum crispum), and walnut oil (Juglans regia cold-pressed from Périgord or Lot walnuts) are combined in a wide bowl and worked together until the fish takes on the walnut oil and the potato partially crushes into the mix — not a smooth purée, but a rough, chunky assembly. Quartered hard-boiled eggs are placed on top. Additional walnut oil is poured over at service.

• Portuguese bacalhau à brás (potato and salt cod parallel)
• Norwegian lutefisk (stockfish preparation)
• Basque bacalao al pil-pil (Atlantic cod tradition)
• Brandade de Nîmes (related cod preparation, different base)

The walnut oil carries nutty, slightly bitter, and deeply aromatic notes that no olive oil can replicate in this context. Garlic paste and parsley provide a sharp green counter to the rich fish-and-walnut combination. The potato's starch absorbs the walnut oil and becomes a vehicle for the flavour. The hard-boiled egg adds richness and a protein counterpoint. This is a dish of extraordinary individuality — it tastes of nowhere but the Lot valley.