This caramel espresso cake is a coffee lover's dream. The cake is moist and espresso-y, and the caramel frosting is rich and buttery. The espresso is brewed and mixed into the cake batter for added flavor and moisture. The caramel sauce is made by cooking sugar until it turns a deep amber color, then adding cream and butter. The result is a rich and buttery caramel sauce that pairs perfectly with the espresso cake. This cake is perfect for any coffee lover.