The carioca is a rich, creamy rum-coffee flip with an unclear history. We found this version on the cocktail virgin blog, as served at bostons green street with the caveat that the only published version of the recipe called for brandy, rather than rum. Brandy doesnt make much sense to us, since by the name the drink would seem to have come from the carioca company, a puerto rican rum distillery. Regardless, it is much better with rum. Green street uses an especially rich, spicy rum (zaya 12 year gran reserve).