In a large, heavy, deep lidded Dutch oven or pot, heat 1 tablespoon of the olive oil over medium-high heat. Add the ground beef, ground pork, and salt and pepper to taste and cook until browned, about 10 to 12 minutes. Transfer the meat to a paper towel-lined plate. Add the pancetta/bacon and cook until crisp, 5 to 7 minutes. Transfer to the paper towel-lined plate.

Reduce the heat to medium and add the remaining tablespoon of olive oil. Add the onion, carrots, and celery and cook until soft and translucent, about 8 minutes. Add the garlic and cook, stirring, until fragrant, about 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 milk, tomatoes, bay leaves, thyme, and cheese rind and stir until combined. Add in the meats and season with salt and pepper.

Bring to a simmer then partially cover and reduce to medium-low. Cook until the sauce thickens, about 1 1/2 to 2 hours. You can also transfer the mixture to a slow cooker and cook for 3 1/2 hours. Discard bay leaves, thyme, and cheese rind. Season to taste with more salt and pepper if necessary. Serve with pasta and grated cheese.