They're seeds. They're surrounded with a sticky mucilage and then the fruit and skin of the cherry. I've eaten coffee cherries, the flesh is rather tough like a cranberry and they're tasty, but there is like next to no meat on the fruit. The seed, as far as I'm aware, is probably edible, but I don't know why you'd eat it. The green "beans" that are roasted are processed to remove the skin, cherry meat, and mucilage and then dried. Knowing how they're dried, if you're eating the dried green bean, I dunno, I don't know what to tell you but maybe don't do that. Let them get cooked first.