Something I dimly remember:- In the Advanced Dungeons and Dragons Planescape campaign, "tieflings", a crossbreed between demons/devils and humans/demihumans, are described as having a very strong preference for raw meats over cooked meats, and prefer eating only animal foods - the "aasimar" in the planescape campaign, who are a crossbreed between angels and humans/demi-humans, by contrast, are described as not liking raw meat as they are supposedly too "civilised" to try it!
Other evil-aligned monsters/NPCs in AD&D are often described as having a preference for raw meats in order to supposedly "emphasise" their evil, immoral behaviour in other areas.