Your favorite chocolate buttermilk cake recipe, with extra black cocoa, if you can get it. Soak the cake in buttery rum syrup. Then, whip up some coconut milk buttercream (butter, powdered sugar, coconut milk and vanilla). Frost, and top with toasted coconut flakes. Pipe on some rum-infused chocolate ganache (the best dark chocolate you have, cream and more rum). Remember nothing shows love and friendship like a very good cake.