Ragù alla Bolognese From The Glorious Pasta of Italy Recipe

Name: Ragù alla Bolognese From The Glorious Pasta of Italy Recipe
Ingredients: 3 tablespoons extra-virgin olive oil; 3 tablespoons unsalted butter; 2 cloves garlic, minced; 2 large carrots, peeled and finely chopped; 2 large celery ribs, finely chopped; 1 large yellow onion, finely chopped; 1 tablespoon minced fresh flat-leaf parsley; 1 pound ground beef; 1 pound ground pork; 1 pound ground veal; 1 cup dry white wine or dry sherry; Kosher or fine sea salt; Freshly ground black pepper; Pinch of freshly grated nutmeg; 1 cup whole milk; 1 (7-ounce) tin tomato paste; 2 cups homemade meat broth or best-quality low-sodium, fat-free commercial beef broth; 1 cup heavy cream; 4 ounces thinly sliced mortadella, cut in julienne