Minced steak (ground beef), some fine chopped onion, pinch of mixed herbs, salt and pepper to your taste. Boil in water until cooked.

Make a gravy - melt a little dripping (solid oil will do). Mix in plain flour until all fat is absorbed (it becomes crumbly). Slowly add water from the meat mix and stir over low heat. Add water until it becomes a nice gravy mix. (As thick or thin as you like.) Mix this gravy in with the meat. That is your pie filling.