Mary Berry’s Foolproof Cooking episode 4br This episode features scrumptious goodies to thrill the family and keep them coming back for more! First, Mary prepares a simple and easy herb flatbread that the whole family can muck in with. Next up, she enlists the help of two of her older granddaughters to prepare a delicious chicken and bacon lattice pie, with foolproof lattice pastry. Mary then moves on to a dish popular with her family - a light tuna salad with avocado and lemon mustard dressing. Then, to satisfy everyone's sweet tooth, Mary and her grandsons make cranberry and coconut energy bars.