Spaghetti Bolognese

Name: Spaghetti Bolognese
Ingredients: 1/4 cup extra-virgin olive oil; 1 1/2 pounds ground beef chuck; 1 1/2 pounds ground veal; 1/2 pound ground mild Italian sausage; 2 white onions, chopped; 2 carrots, chopped; 6 cloves garlic, thinly sliced; Kosher salt and freshly ground pepper; 1/2 cup tomato paste; 1 small bunch thyme; 1 sprig rosemary; 1 cup dry red wine (or use beef stock); 2 cups beef stock; 2 28-ounce cans whole peeled San Marzano tomatoes, crushed by hand; 1 3-inch piece pecorino romano cheese rind, plus shaved cheese for topping; 1 pound spaghetti