Hermione had not packed any food in her magical bag, as she had assumed that they would be returning to Grimmauld Place that night, so they had had nothing to eat except some wild mushrooms that Hermione had collected from amongst the nearest trees and stewed in a billycan. After a couple of mouthfuls Ron had pushed his portion away, looking queasy; Harry had only persevered so as not to hurt Hermione’s feelings.
(Harry Potter and the Deathly Hallows, J.K.Rowling)