I can imagine a culture, let's say Myrians or Borrellians, eating the hearts of things they hunt. Maybe a polar worm or... I can't think off the top of my head what might be a good candidate for Myria. ^^;
I do think their point about it being an interesting way to flesh out the culture of a setting is apt, though; these people are surrounded, sometimes even besieged, but fantastical things every moment of every day of their lives. There's real-world precedent for this sort of behavior, and I think that some things, like torgat hunts for instance, are already present in Khoras, so it seems like it's an interesting thing to think about, even if the specific ideas they provided aren't to taste. Why wouldn't people try eating at least some monsters. People eat all sorts of weird things, ya know?
But yeah, mostly I just enjoyed the exercise in thinking about ways that culinary culture and alchemy might intersect, and more broadly, the implications that a campaign setting's monsters and fantastical creatures might have for what people eat, and how they relate to the world. And further, how thinking about that might lead to better gaming and better world-building.