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1
In a heavy-bottomed pot or Dutch oven set over medium heat, render the pancetta in the butter until the fat runs clear and the pancetta softens without colouring. Add the onion, celery, and carrot. Cook, stirring occasionally, until the vegetables are completely softened and translucent — the soffritto should be tender throughout and just beginning to turn a pale gold at the edges.
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2
Raise the heat to medium-high. Add the ground beef chuck, breaking it up thoroughly with a wooden spoon or spatula. Stir and break the meat continuously until it is entirely grey — no trace of pink remaining. The meat must not brown; the correct endpoint is uniformly grey. This is where the dish lives or dies: any browning of the meat at this stage makes the sauce dry and harsh in the finished ragù, and it cannot be corrected by subsequent cooking.
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3
Pour in the whole milk. Reduce the heat to medium and cook, stirring occasionally, until the milk is completely absorbed and no pooled liquid remains visible in the pan. The fat in the milk coats the meat proteins before the acidic wine is introduced; the milk must be fully absorbed before proceeding.
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4
Add the white wine. Cook at a steady simmer, stirring occasionally, until the wine's alcohol has fully evaporated — the sharp, raw edge of the wine's scent should have disappeared, leaving only a faint fruit acidity.
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5
Stir in the tomato paste. Mix thoroughly so it is fully incorporated into the meat. The tomato functions as accent, not base; the mixture should not appear red or tomato-forward.
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6
Reduce the heat to the lowest possible setting. The surface should barely tremble. Set the lid slightly ajar to allow slow evaporation. Simmer for a minimum of 3 hours; 4 to 5 hours produces the correct result. During cooking, check every 30 to 45 minutes: if the sauce begins to dry out, add whole milk or water a tablespoon at a time. After 2 hours, the ragù should smell deeply of beef, sweet onion, and a faint acidity — the components still individually legible. After 3 to 4 hours, the smell should be unified and complete, no single element identifiable, the whole a single complex aroma.
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7
The ragù is finished when the meat has broken down to a very fine, even texture — no identifiable chunks — surrounded by a sauce that just coats and clings to the solids. It should look like a densely sauced preparation, not a stew with broth. The taste should be rich, meaty, and sweet from the soffritto, with a faint wine acidity and the barest tomato note. Not salty; not assertively tomato-flavoured.