Leftover sandwiches are the best. And by leftovers I mean pretty much any leftovers. Pasta (especially with meatballs or chorizo or something) Boiled potatoes Mashed potatoes Rice Cold vegetables Meat joints Chilli con carne Might need to add a bit of something else to get it to stick together as a sandwich, like ketchup or Camembert or use a shit ton of butter or something, but if you can put it between two pieces of bread, you're in for a goddamn treat.