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.