Directed by Andy Devonshire. With Mel Giedroyc, Sue Perkins, Mary Berry, Paul Hollywood. The signature bake features a cake leavened with yeast, inspired by classic European cakes. The technical challenge is for Mary's Swedish princess cake, and the showstopper requires the bakers to make a modern version of the Hungarian Dobos torte, with at least two tiers and decorated with caramel.