 Detective Alan Grant is offered rock buns in Josephine Tey's novel "The Daughter of Time".They are also a common feature in the popular "Harry Potter" series of books and films; for example, Hagrid serves rock cakes to Harry and Ron at tea in "Harry Potter and the Philosopher's Stone".Early in "The African Queen", Mr. Allnut (Humphrey Bogart) is offered a rock cake while at tea.