This document provides a recipe for a Porter cake. It calls for creaming butter and sugar together before mixing in eggs, flour, baking powder, salt, mixed spice, sultanas, candied peel and Guinness beer. The batter is divided between two cake pans and baked for 30-35 minutes. Meanwhile a frosting is made by softening chocolate chips and butter in a double boiler before mixing in more Guinness beer and milk. Once cooled, the layers are frosted and served.