Authentic Bolognese Sauce

Name: Authentic Bolognese Sauce
Prep time: 15 min
Cook time: 2 h 15 min
Total time: 2 h 30 min
Yield: 8
Ingredients: Ingredients; 2 tablespoons olive oil; 2 tablespoons unsalted butter; 1 medium onion, finely chopped; 1 medium carrot, finely chopped; 1 celery stalk, finely chopped; 3 cloves garlic, minced; 1 pound ground beef (or a mix of beef, pork, and veal); 4 ounces pancetta or bacon, finely chopped; 1 cup whole milk; 1 cup dry white wine; 1 can (28 oz) crushed tomatoes (or 1 1/2 cups tomato purée); 1/2 cup beef or chicken broth (optional); 1/4 teaspoon nutmeg; Salt and pepper, to taste; Parmesan cheese, grated (for serving)