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To make the Bolognese sauce, in a Dutch oven or other large, heavy pot over medium-low heat, melt the butter. Add the carrots, celery, onion, and pancetta and cook, stirring occasionally, until the ingredients are tender and a rich golden brown, about 30 minutes. If the ingredients begin to brown too much, reduce the heat and stir in a spoonful or two of warm water.
Add the ground meats to the pot and stir well. Raise the heat to medium and cook, breaking up the meats with a wooden spoon, until lightly browned and crumbly and their juices have evaporated, about 20 minutes. Add the wine and deglaze the pot, scraping up the browned bits from the pot bottom. Cook until the wine evaporates, about 2 minutes. Stir in the tomatoes, the tomato paste, the 2 cups stock, the milk, 1 teaspoon salt, 1/4 teaspoon pepper, and the nutmeg. Cook the mixture until it just begins to simmer, then reduce the heat to very low and continue to cook, stirring occasionally, for about 1 hour. If the sauce becomes too thick or threatens to scorch, add a little more stock.
Partially cover the pot and continue cooking the sauce on the lowest heat setting until it is thick and dark brown, 1-11/2 hours longer. When the sauce is ready, use a large spoon to skim off and discard any fat that floats on the surface. Cover the pan and set aside. While the sauce is simmering, make the pasta dough, then divide and roll out each piece into a sheet 1/16 inch (2 mm). Following the directions for cutting pasta strands, cut the pasta sheets into tagliatelle (the widest setting) and let dry for 10-20 minutes. Bring a large pot three-fourths full of water to a rolling boil and add about 2 tablespoons salt. Add the tagliatelle, stir well, and cook, stirring occasionally, until al dente, 1/2 - 2 minutes.
While the pasta is cooking, reheat the sauce over medium-low heat. Taste and adjust the seasoning with salt, pepper, and/or nutmeg. When the tagliatelle is ready, scoop out and reserve about 2 ladlefuls of the cooking water, then drain the pasta. Add the drained pasta to the sauce in the pot and stir and toss until well coated with the sauce, adjusting the consistency with some of the cooking water if needed. Transfer to a warmed serving bowl and serve at once. Pass the cheese at the table.
Buon appetito !
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