- In a large sauté pan over medium-high heat, warm 1 tablespoon of the olive oil. Add the ground beef and pork, and season with salt and pepper. Cook, stirring occasionally, until browned, about 12 minutes. Transfer to a paper towel-lined plate. Add the pancetta to the pan and cook, stirring occasionally, until crisp, about 7 minutes. Transfer to a paper towel-lined plate.
- Reduce the heat to medium and warm the remaining 1 tablespoon olive oil. Add the onion, carrots and celery and cook, stirring occasionally, until soft and translucent, about 8 minutes. Add the garlic and cook, stirring constantly, for 1 minute. Stir in the tomato paste and cook for 2 minutes. Add the wine and simmer until almost evaporated, about 5 minutes. Add the ground meats, pancetta, milk, tomatoes, bay leaves and cheese rind. Season with salt and pepper and bring to a simmer.
- Cover partially, reduce the heat to medium-low and cook, stirring occasionally, until the sauce thickens, 1 1/2 to 2 hours. Remove and discard the bay leaves and cheese rind.
- Toss the pasta with about 3 cups (24 fl. oz./750 ml) of the sauce (reserve the remaining sauce for another use). Sprinkle cheese on top. Serve immediately and pass additional cheese alongside.