Grated Parmesan cheese Cook and stir meat and onion in large skillet or Dutch oven until meat is brown. Drain off fat. Stir in remaining ingredients except spaghetti and cheese; heat to boiling. Reduce heat; cover and simmer 1.5 hours, stirring occasionally. Remove bay leaf. Cook spaghetti as directed on package; drain. Serve sauce over spaghetti and sprinkle with Parmesan cheese.