High School Meat Loaf

1 pound hamburger
1/2 pound pork sausage
2 cups dry bread crumbs
1 egg, well beaten
1 1/2 cups milk
1/4 teaspoon dry mustard
1/2 teaspoon sage
1/4 teaspoon pepper
2 teaspoons salt
1/4 cup onion, minced

Mix. Place in loaf pan. Bake 1 1/2 hours at 350 degrees F. If desired: Remove loaf from oven 15 minutes early, cover loaf with catsup, continue baking.