Some authors are better at food descriptions than others. For some, food is more of a vehicle; the characters chat while having tea, the situation happens in a cafe, a celebration involves food.
For others, food seems to act as a source of inspiration, a muse of sorts. For these writers, the food helps create a world, develop personalities, and tingle the tastebuds of the reader.
J.K. Rowling is of the latter type. Her food descriptions, perhaps even moreso than the magic, make me want to live in the world of Hogwarts.