I was thinking through what would happen should the OP follow the advice by another user which recommended baking the mortar and pestle.
Since it has a heavy film of fats,my thought is that baking at a low temp would create a finish similar to that on seasoned cast iron. I’m not thinking that would be a plus but others might think otherwise.
I’m still seeing this as an active posting, linked on other UN pages e.g.,
https://dppa.un.org/en/gazas-new-terror-booby-trapped-cans-of-food-unwary
However, a similar claim in January was found to be false by fact checking news orgs.
https://www.politifact.com/factchecks/2024/feb/01/instagram-posts/no-viral-footage-doesnt-show-explosives-disguised/