I don't keep scraps ( I send them to my sister who loves them) or a stash. I buy groceries once a week with a list, based on what's in season and on special. My freezer, fridge and cupboards keeps enough food for the week. I don't eat left overs. They go to the dogs, rabbits and chickens.
I am definitely a minimalist in all areas of life. Absolutely no waste but absolutely no clutter.