George's Marvelous Medicine with the Potterverse. Inspired by the line at the end about George having a sense that he had "touched ... the edge of a magical world".
Because really, aside from the mundanity of all of the ingredients themselves, that concoction fits the concept of a potion just perfectly... and it would neatly explain the significant differences in effect that they got from just the small changes in formulation when they were trying to reproduce it, not to mention the nature of the effects themselves.
I haven't read the book in a while, but I think George might be young enough to plausibly be a not-yet-notified Muggleborn... and if they can reliably reproduce the effects of some of those potions, I think he's got a potentially pretty good market on his hands. (Though probably not as good as it would be if he and his parents could sell giant food animals on the global market, instead of having to worry about the Statutes of Secrecy.)
Because really, aside from the mundanity of all of the ingredients themselves, that concoction fits the concept of a potion just perfectly... and it would neatly explain the significant differences in effect that they got from just the small changes in formulation when they were trying to reproduce it, not to mention the nature of the effects themselves.
I haven't read the book in a while, but I think George might be young enough to plausibly be a not-yet-notified Muggleborn... and if they can reliably reproduce the effects of some of those potions, I think he's got a potentially pretty good market on his hands. (Though probably not as good as it would be if he and his parents could sell giant food animals on the global market, instead of having to worry about the Statutes of Secrecy.)