In this episode, host Christopher Kimball goes to London's Violet Bakery to visit with rising pastry star Claire Ptak. While there, he learns some of her baking techniques, such as under-whipping egg whites for a lighter cake. Back at Milk Street and in the kitchen, he puts that information to work, making chocolate, prune and rum cake with Milk Street Cook Matthew Card. Next up is Milk Street Cook Erika Bruce who shows Chris how to make a brown sugar tart with their foolproof single-crust pie dough. The show ends with Chris explaining how a Japanese baking technique coupled with a cornstarch paste ended his 30-year search for a prebaked pie crust that won't slump in the pan.