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1
Pat the goat pieces thoroughly dry so the surface sears rather than steams, then heat the olive oil in a wide, heavy braising pot over medium-high heat and brown the goat well on all sides in batches, without crowding. Remove and set aside. Each piece should show a deep amber crust with no raw grey patches, because it is this colour and the fond it leaves behind that will give the finished braise its body and depth.
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2
Reduce the heat to medium, add the sliced onion to the same pot, and cook in the remaining oil and meat juices for approximately 10 minutes, so the onion picks up every trace of flavour left by the goat. The onion should smell sweet and caramelised, with no raw sharpness remaining.
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3
Deglaze with the white wine, scraping up all the residue from the base of the pot so nothing good is wasted, and allow the liquid to reduce by roughly half over medium heat. When the sharp alcohol smell has blown off and the liquid smells clean and fruity, the wine has done its work.
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4
Return the browned goat to the pot, add the crushed tomatoes, peperoncino, and salt, then pour in enough water to almost cover the meat. Bring to a gentle simmer, cover, and braise over low heat for 1 hour 30 minutes to 2 hours until the meat yields completely when pressed and begins to ease from the bone — goat is structurally tougher than lamb and will taste tight and fibrous if pulled from the heat too soon, and a chewy result cannot be corrected at the table. This is where the dish lives or dies.
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5
Uncover and assess the braising liquid; if it appears thin, raise the heat briefly and reduce until the sauce is deep, slightly glossy, and coats the back of a spoon. Adjust the seasoning.
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6
Remove the pot from the heat entirely, then tear the fresh spearmint leaves by hand and stir them through the braise, so the residual warmth — rather than active heat — draws out their volatile fragrance without driving it off or turning the leaves bitter and brown. Cover the pot and rest for 5 minutes; the leaves should wilt to a deep, vivid green.
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7
Serve directly from the pot with Calabrian bread alongside. The sauce should smell simultaneously of rich braised meat and fresh mint, the two present together rather than one masking the other.