The 10 remaining amateur cooks' tart-making abilities are put to the test in the third round of the competition. Their first task is to bake a tarte tatin, with judges Paul Hollywood and Mary Berry wrapping their teeth around all the efforts. The hopefuls then face another daunting technical challenge as they try to replicate Mary's seemingly straightforward recipe for treacle tart, but the delicate task of adding a lattice top leaves some contestants slightly flummoxed.