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.
A lot of what fans think is canon just isn’t anyway. Most so-called ‘violations’ are just different interpretations of what was shown on screen decades ago.
There’s an entire list out there of all the headcanon that fans hold up that just isn’t supported by what’s on screen.
Writers shouldn’t be held to fan interpretations of what they thought they saw in TOS or TNG.
In other words, fans who clearly live in glass canon houses shouldn’t throw stones.