In this episode, Milk Street highlights the perfect recipes for a wintertime meal. Milk Street cook Matthew Card prepares a hearty fennel-rosemary porchetta, consisting of aromatic herbs and peppery spices. Milk Street cook Erika Bruce shows Christopher Kimball how to make a simple, yet decadent chocolate-hazelnut (gianduja) crostata. Finally, Milk Street cook Catherine Smart prepares mashed potatoes with caraway-mustard butter using an Indian flavoring technique known as tarka, in which herbs and spices are added to hot butter.