One big point of waste in any food budget can be leftovers, I really noticed it this summer when I was working. I wasn't home to re- purpose the leftovers , the kids followed the menu, just adding more left overs to the fridge, which usually found themselves in the trash at the end of the week.
We don't usually serve leftovers as just reheated food, mostly because there never is quite enough for all, and they go over better if re-made into another meal. I keep a running list of meals that can be made out of different leftovers right now the list is in my head, but I am working on getting it onto paper.
Ham and potatoes for dinner, turn the leftovers into a egg casserole, layer the potatoes, then ham diced, and then top with some cheddar cheese and enough beaten egg to cover. Bake at 350 till done.
Only left over potatoes - fry them up for breakfast.
Leftover taco meat, cheese, and soft shell tortilla- beat some eggs, scramble the taco meat and eggs together, serve wrapped in a tortilla topped with cheese and taco sauce or even tomato if you have them.
Leftover chili - boil some noodles, mix in chili.
Leftover chicken and rice- make fried rice
Odd pieces of meat save them for pizza night and have chicken or ground beef on top of the pizza.
How do you re- use leftovers ?