Ever (try to) eat a tree-ripened olive? “There can only be one!” Any more than that marks you as a determined, masochistic Darwinian Candidate.
I really have to wonder who (and how/why) discovered the process to make them edible.
“Yech! You can’t eat those things!”
“Blech!! I can’t drink this crap, either...”
“Hey; maybe if I soak those in this, then ....”
I love olives any way they appear.
There are a number of foods that seem unlikely as a food source for early man. Lobster is one that comes to mind.