Mathematically, I have no idea where the tokens come in exactly. My studies have been more conceptual than actually getting down to the knitty-gritty, for the most part.
But conceptually, from my understanding, tokens are just a variable that is assigned a speculated fitness, then used as the new "base" data set.
I think chicken would go good in this, but beef wouldn't be as good. My token is the next ingredient i am deciding to put in.