My bad. I thought that we were still talking about blueberries.
Yes chocolate in Mexican inspired food is common and does exactly what you said. Dang it, now I want some chicken mole. (rhymes with "Ole"")
Mexican Mole Sauce Recipe (Chicken Mole) - The Forked Spoon
Sorry, i got sidetracked by chocolate, it happen often only this time i can blame @Nimos