its my understanding that the ' soap ' taste is genetically determined.
I cant say if that gene if prevalent in FR.
I first heard of epazote in an early Diana Kennedy book
back when real Mexican Food was quite exotic
and quite different from Tex-Mex.
I used it for a while trying to be Authentic , then gave up on it.
in those early books , she said it grew wild in Central Park and she picked it there
I may of crows be mistaken. it is a weed after all .