Heat oven to 400°F. Beat egg in large bowl. Add ground beef, bread crumbs, onion, bell pepper, salt, celery salt, 1/8 teaspoon ground red pepper and 2 tablespoons of the tomato sauce; mix well. Shape mixture into 48 (1 1/4-inch) meatballs, using about 1 tablespoon mixture for each. Place in ungreased 15x10x1-inch baking pan.