2 tablespoons oil
1 medium onion — chopped
3 cups potatoes — cooked and diced
3 cups beef — cooked and diced
1 teaspoon salt
1/8 teaspoon pepper
1/2 cup gravy
2 tablespoons ketchup
1 teaspoon mustard
In skillet, brown onion in oil. Add remaining ingredients and cook until well browned.