[munk-a]

I think the closest analogue you can find is peanut allergies, but (as far as I've ever seen) no body has that sort of anaphylaxis reaction to meat or the taste of it.

Cooking the burger in beef/pork fat would likely be noticeable, but that is pretty trivial to avoid and _usually_ grills are crudely scraped down between different grillings, that will remove everything but trace amounts.

[benj111]

An allergy isn't a moral choice. Not eating meat is, for many people at least.