It takes place in a prehistoric era. The man is sick to death of the meat he's been eating and he discovers that adding something (onions, garlic, or salt - I can't remember) makes it appetizing again. He compares the meat which "fills the stomach but not the mouth" and the additive which "fills the mouth but not the stomach'.
I read it in a sci-fi anthology probably in the 60s or 70s. It was a fantasy, tonally like Clan of the Cave Bear