In a large pot, heat the oil over medium high heat. Add the pancetta and cook, stirring, until browned and the fat is rendered, about 4 minutes. Add the onions, carrots and celery and cook, stirring, until soft, 4 to 5 minutes. Add the garlic, nutmeg and thyme, and cook for 30 seconds. Add the wine, stir to deglaze the pan, and cook until the liquid is nearly all evaporated, about 3 minutes. Add the shredded meat, tomatoes and gravy and simmer, stirring occasionally, over medium high heat until the sauce is thickened and flavorful, 20 to 30 minutes. Stir in the cream and parsley, and adjust the seasoning, to taste. Remove from the heat and cover to keep warm.

Meanwhile, bring a large pot of salted water to a boil. Add the fettuccine until al dente, about 10 minutes. Drain and add to the pot with the sauce, tossing to coat the pasta. Add 1/2 cup of the cheese and toss to blend.

Divide among pasta bowls and serve with the remaining cheese passed tableside.