This four-star showstopping recipe is from Bon Appétit (April 2009). It's a little effort but it's well worth it for special occasions. For a richer, darker cake and frosting use part or all Hershey's Special Dark Cocoa. Frosting must chill for at least 2 hours. DO AHEAD: Cake (either assembled or not) can be made 1 day ahead. Cover with cake dome; chill. Let stand at room temperature at least 20 minutes before serving.