Resurrection pie – a pie made of scraps or leavings (1891 American Slang Dictionary by James Maitland)

For Example:

1. Spaghetti Pie: 1. mix left over spaghetti and sauce with additional mozzarella cheese and an egg; 2. You can also add spinach and additional meat if you like or put it in a pie shell; 3. bake ’till done.
2. Resurrection Sheppard’s Pie: 1. chop up left-over meat of any variety; 2. mix with left over veg (broccoli, brussel sprouts, carrots, cauliflower, celery are all good); 3. heat on the stove in a dutch oven with complimentary broth thickened with cornstarch; 4. when appropriately stew like, cover with re-hydrated instant mash potato, sprinkle some cheese on top and put in oven for 30 min. or so.