but seriously, chesseburgers are a bad idea, for the torah commands us, do not boil a kid in its own mothers milk.
what is basically explicitly prohibited is boiling a baby cow in the milk of its own particular mother. seems liek a very easy thing to avoid. like, no one would ever do that.
how the rabbis got from that, to don’t eat cheeseburgers, is a subject that would require a lot more time than I have to understand. I was told that rabbis draw a “wide fence around the torah”, meaning they interpret the rule as broadly as humanly possible, to avoid any possible error.
interestingly, jewish law prohibits eating insects, but makes an exception for crickets, grasshoppers and locusts, which may be eaten. crickets grasshoppers locusts are kosher, but silkworms or fried waterbugs, no.