Hermione blinks. "It's not strictly for children," she remarks with a quirk of her eyebrows. "It's a very comforting drink, so long as you have something of a sweet tooth." She does have to shake her head, though, telling him, "Food is the first of the five Principal Exceptions to Gamp’s Law of Elemental Transfiguration. I can't produce food or drink out of thin air - aside from water, or unless I know of a spell that can almost instantly bring together all the ingredients to make a particular thing. But perhaps I can talk to someone in the tavern and see if it would be possible to make something like that with what we have available."