Ok, this is the coolest thing I have learned this year...
In Scandinavian households, they keep a 'pickling jar' that is used to preserve all of thier leftover scraps from cooking.
Simply put, a pickling brine that constantly sees an influx of edible flotsam and jotsam from the prep-cook process.
Shoot, you don't even have to cover the dang thing, as long as the material doesn't stretch over the water-line.
I recently learned not to place un-washed buffalo mozzarella, but otherwise, we're gold.
Zero waste, my absolute favorite thing!