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1
Three days before cooking, place the live snails in a ventilated container. Scatter the coarse salt over them and lay in the wild fennel fronds. Hold at cool room temperature for 3 days, allowing the snails to purge their digestive tract content entirely. Rinse the snails thoroughly and repeatedly in cold water until the water runs clean.
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2
Place the purged snails in a large pot and cover with cold water. Bring to a full boil, hold at the boil for 2 minutes, then drain and rinse under cold running water. The snails will have retracted and set within their shells; the cooking water, which carries the final surface impurities, is discarded. The shells should show no foam or discolouration.
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3
Place the diced lardo di Colonnata in a cold, heavy-based pot or casserole. Set over a low flame and render it slowly, stirring occasionally, until the fat is fully liquid and the solid pieces are translucent and beginning to colour at the edges. The rendered fat should smell of herbs and cured pork; this is the foundation of the sauce and cannot be rushed.
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4
Add the garlic and rosemary to the rendered lardo fat. Allow them to soften and perfume the fat over a gentle heat for 2–3 minutes. Add the tomatoes and stir to combine with the fat. Pour in the white wine and raise the heat briefly to drive off the raw alcohol. The sauce should smell of tomato, wine, rosemary, and lard in equal measure — no single note should dominate.
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5
This is where the dish lives or dies. Add the blanched snails to the soffritto and braise, stir to coat every snail in the sauce, then cover the pot and set to a gentle, steady simmer. Cook for a minimum of 2 hours without rushing. The snail muscle yields only to prolonged, gentle heat; high heat or abbreviated time produces a rubbery texture that no subsequent cooking will correct. Every 20–30 minutes, stir, and add a small amount of water if the sauce threatens to catch. In the final 30 minutes, uncover, add the vin santo, and allow the sauce to begin reducing. If the sauce remains too thin, remove the snails with a slotted spoon, reduce the sauce over a medium flame until it coats a spoon, then return the snails. The snails are done when they yield with slight but definite resistance to a fork passed through the flesh — tender, not collapsing.
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6
Taste and adjust for salt, bearing in mind the lardo is already well seasoned. Remove the rosemary sprigs and garlic if preferred. Serve the snails in their shells in wide bowls with the sauce spooned liberally over. Present the toasted pane sciocco alongside for scooping. The sauce should be glossy, mahogany-red, and coat the back of the ladle without running.