Salted caramel buttercream made with real caramel is the most decadent, delicious, salty and sweet frosting around. This is a tried and true recipe and tutorial. (same recipe as the chocolate cake recipe, but with a more in-depth how-to)
Dark Chocolate Raspberry Curd-filled Cupcakes -- For curd - use fresh raspberries, and less butter or liquid for more solid curd. Cupcake batter - try sugar and flour. Frosting - use two vanilla beans to steep.