A popular podcast I listened to once described cake as a frosting-delivery mechanism. While this chocolate spongecake can stand on its own, it is incredible for layered cakes because it has a light consistency and a rich flavour without being overpowering.
Chocolate Icing
Melt some chocolate, melt some butter, and you have a delicious icing for your cakes. Done right, this coating is good enough on its own. It's my personal practice that anytime a recipe has a flavouring option, I'll default to the one that uses rum, bourbon, cognac, or any other spirit. This recipe should be enough to coat a two-layer cake.