Classic Bolognese Sauce

Name: Classic Bolognese Sauce
Prep time: 15 min
Cook time: 210 min
Total time: 225 min
Yield: 6
Ingredients: 2 ounces pancetta, finely chopped; 1 medium Spanish onion or yellow onion, finely chopped; 1 celery rib, finely chopped; 1 carrot, finely chopped; 3 tablespoons unsalted butter; 12 ounces ground beef; 4 ounces ground pork; 4 ounces Italian sausage, casings removed, if needed; Dash ground cloves; Dash ground cinnamon; 1 teaspoon freshly ground black pepper; 2 pounds peeled and chopped tomatoes (or one 28-ounce can whole peeled tomatoes, packed in water); 1 cup whole milk; 1/2 teaspoon sea salt