Maybe they made an exception in this particular case, just to disinfect the Firekkans. Bird flu, you know.
I think the real question is, would they trust a human to cook another human. That would be like killing a deer and then having another deer cook it up for you. That's a terrible idea, deer don't eat other deer, so they wouldn't know what spices to use or what type of wine goes well with themselves. I mean, unless the Kats employ Hannibal Lecter, I doubt their slaves would have good culinary knowledge when it comes to preparing humans.
Ice Cream Man said:This could be a fanfiction horror story: two confed pilots get captured, and one is forced to cook the other for his new master.
It would actually be pretty cool if the inevitable reboot focus on the aspect of the Kilrathi being mysterious and horrifying space monstrosities rather than the pretty cool cat people we all know and love.