Heat oven to 350 degrees. Combine all ingredients except tomato sauce and Mozzarella cheese. Mix lightly. In a 10 x 6" loaf pan, shape loaf. Bake 1 1/2 to 2 hours. Drain excess fat. Pour tomato sauce over loaf during last 1/2 hour of baking time. Place Mozzarella cheese on top. Bake 5 to 10 minutes. Serves 4 to 6.