Reading about food waste has always bothered me. Growing up in a Jewish orthodox household wasting food was verboten. There is even a mitzvah (commandment) regarding wasting food and or resources[1].
I think that mindset drove me to be named the "leftovers king" by my extended family, as I repurpose leftovers into delicious meals.
There are a couple techniques that can help turn fridge leftovers into really good meals besides for soup. You can make an amazing Frittata using whatever leftover veg and protein you have.