Cocoa, coconut milk, and dark rum combine to make a smooth, silky, and sweet (but not too sweet) drink. This would be just as decadent served before or after dinner—or, frankly, as an afternoon, après-ski type of drink.
A fun idea for a party is to make two versions of this cocktail, one with dark chocolate and the other with white, and serve them in cordial glasses (the ones you inherited from your grandmother and don’t know what to do with) as part of dessert or as an after-dinner drink.