Bolognese Meat Sauce

Name: Bolognese Meat Sauce
Ingredients: 1 tablespoon vegetable oil; 3 tablespoons butter, plus 1 tablespoon for tossing the pasta; 1/2 cup onion, chopped; 1/2 cup celery, chopped; 1/2 cup carrot, chopped; 3/4 pound ground beef chuck (see prefatory note); Kosher salt; Freshly ground b lack pepper; 1 cup whole milk; Whole nutmeg; 1 cup dry white wine; 1 1/2 cups canned imported Italian plum tomatoes, cut up, with their juices; 1 1/4 to 1 1/2 pounds pasta; Freshly grated Parmigiano-Reggiano cheese, for serving