Rum is a type of alcoholic beverage.
There is a spell that can allegedly turn water into rum, though Seamus Finnigan, the only known user, was only able to manage a "weak tea" when he attempted to use it in 1991.
Minister for Magic Cornelius Fudge enjoyed some red currant rum while at the Three Broomsticks Inn in 1993.
The treatment for Squabbs Syndrome includes keeping the dragon warm and feeding plenty of chilli, pepper and a crate of rum four times a day.
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