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1
Place the diced pancetta in a cold, heavy-based casserole or saucepan. Set over medium-low heat and render slowly until the fat is fully liquid and the meat is lightly coloured but not crisp. The pan base should be filmed in pale pork fat with no dry spots — this is the structural fat of the dish.
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2
Add the diced onion, carrot and celery to the rendered pancetta and its fat. Sweat over low heat, stirring, until the vegetables are completely soft and translucent, without taking colour. The soffritto is done when no raw onion sharpness remains in the steam rising from the pan.
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3
Add the coarse-minced beef to the soffritto without pre-browning it separately. Stir to combine with the fat and vegetables, breaking the mince into loose, fine grains. Cook over medium heat until the meat has lost all pink colour and any released liquid has evaporated. The surface of the meat should be lightly coloured but not seared — the texture must remain loose and granular, not crusted.
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4
Pour in the white wine. Raise the heat slightly and stir, scraping any residue from the base. Allow the wine to evaporate completely. This is where the dish lives or dies: the wine must be fully cooked off before the milk is added — residual alcohol will curdle the milk and prevent the lactose from integrating cleanly with the meat. The pan is ready when the sharp acidity of wine is no longer detectable in the rising vapour and the liquid has reduced to nothing.
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5
Add the whole milk in a first measure of approximately 75 ml. Stir and allow it to be absorbed fully over gentle heat before proceeding. The sauce should look pale and slightly creamy; the milk will sweeten the meat and balance the wine's residual tannin as it absorbs.
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6
Stir in the tomato paste and add the bay leaf. The paste should dissolve into the fat and meat base, colouring the sauce a deep amber without dominating it. The quantity must not exceed two tablespoons — tomato is background, not foreground. Stir until evenly distributed.
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7
Add enough water or light stock to barely cover the meat. Reduce the heat to the lowest possible simmer — the surface should show only an occasional, lazy bubble. Cook uncovered for a minimum of two hours, adding the remaining milk in small additions every 30 minutes as moisture evaporates. At the end of the cook the sauce should be dense, cohesive, and deeply amber-brown, with visible fat pooling at the edges. A flat, thin, or sharp-tasting sauce means insufficient time.
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8
Bring a large pot of generously salted water to a rolling boil. Cook the fresh egg tagliatelle until just tender — fresh pasta requires only 2 to 3 minutes. The strands should offer slight resistance when pressed between thumb and forefinger but show no raw flour at the centre.
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9
Drain the tagliatelle, reserving a small amount of pasta water. Add the pasta directly to the ragù in the pan over low heat. Toss to coat each strand evenly, loosening with a spoonful of pasta water if needed. The finished dish should show sauce clinging to every ribbon of pasta with no pooling liquid at the base of the bowl.