It is like a literal version of Stone Soup
Double food crime if they’re fried up in gutter oil!
It can be used to describe the illicit practice of restaurants reusing cooking oil that has already been cooked with longer than safety codes permit. It can also be used to describe the reprocessing of rancid yellow grease collected from sources such as restaurant fryers, kitchen and slaughterhouse waste and sewer drains.
Calling it now, this will become an expensive specialty seafood dish. There’s precedent for foods with rocks as an ingredient to get a substitution for clams and oysters
Edit: there’s an Italian soup that got it’s name in a famine because it was literally cooked with river rocks
I believe the name was based on a European folk tale, not actually using stones as ingredients. Here’s an account of the fable.
Here is an article specifically about the Italian dish you’re referring to, which also attributes its name to the fable; not actual stones as an ingredient.
Stone soup in the European sense typically just refers to a hearty soup with basic ingredients and is just reference to the fable meant to promote sharing/community. There’s a lot of retelling of it, including other inedible objects other than stones.
