Do you have a favorite dessert? I do! If I had to choose one that I’d ask the Hogwarts house-elves to whip up on a visit to the kitchens, it would have to be lemon merengue pie… or maybe mint chocolate chip ice cream… or salted caramel pudding. Shoot, how can I choose? As you already know, I’m a Slytherin who wants it all; but Harry Potter’s a brave and determined Gryffindor – and he knows exactly which dessert is his favorite: treacle tart. This dessert isn’t well-known or common outside the U.K., so you might wonder exactly what this dessert is that Harry’s so keen on. To that end,…