Cook pork, sausage, onion, and garlic in oil in heavy lidded pot until meat is browned; drain off drippings. Add remaining ingredients except Parmesan, stir well. Spoon into a greased 12 x 8 x 2-inch baking dish; sprinkle Parmesan cheese over top. Cover and refrigerate 8 to 10 hours or overnight.
Let come to room temperature; bake at 375 degrees F for 30 to 35 minutes or until lightly browned.