I have read many wonderful food scenes in books, and I don't think I could name you my favourite, simply because I cant remember them all. Here are a few that have stuck with me though:
1. The scene in Roald Dhal's 'Boy' when he and his friends place a dead rat in the sweet jar of an old woman's sweetshop.
2. When the fat boy from Roald Dhal's 'Matilda' is forced to eat an entire chocolate cake on stage.
3. The description of the 'drink me' bottled water in 'Alice in Wonderland'.