I used to have the most disgusting chore assigned to me when I was a kid. Not the litter box, not scrubbing the bathroom, not getting all the terrible things under my brother's bed and putting them in the dishwasher. No, the most disgusting chore?
Cleaning out the fridge. My mother, otherwise a good and wonderful woman, was terrible about dealing with leftovers. Made worse by growing up at a time when Tupperware was opaque, meaning what's in the back? No idea. But it is starting to talk about wanting to borrow the car.
In my house we don't have that problem because there is one basic rule: as long as you have eggs, you don't have leftovers. Just ingredients. Eggs are a mystical force that take any random selection of items and join them together to make food. Eggs are a magical binder.