A type of fruitcake with a crunchy exterior served with tea, rock cake takes on a literal meaning when Hagrid makes them. His batches are usually so overcooked that they nearly break teeth when chewed. Though this confection has earned a terrible reputation, when made correctly (and served with blue cheese as is traditional in England), rock cake may earn a place in your heart.
Image Source: POPSUGAR Photography / Anna Monette Roberts