Harry Potter’s birthday falls on Sunday (just like author J.K. Rowling’s) and Muggle fans around the world celebrate it annually with book and movie marathons, Quidditch matches, and, of course, food.

All seven of the Harry Potter books are awash in references to food, starting with Dudley Dursley’s birthday Knickerbocker Glory, an ice-cream treat that Harry got the tail end of, since Dudley complained that it didn’t have enough ice cream on top.

The Knickerbocker Glory seems to have started off as an American soda-fountain treat, but was adopted by ice cream fans in Britain, where it continues to be adored. It’s served in a tall glass and consists of alternating scoops of vanilla and strawberry ice cream, fresh