Book excerpt: A hilarious new picture book by Roald Dahl Funny Prize winner Peter Bently. Little witch Betty makes a big mess when she tries her hand at cooking. Into the cauldron goes everything from strawberry jam to slices of ham! Betty's potion keeps on growing and growing and soon it's spreading all over town. But when a hungry dragon arrives on the scene, can Betty's brew save the day? A spellbinding tale of magical mishaps!