This four-layer, chocolate mousse-filled cake was created for my sister’s latest birthday. Crumb-coated with a deep purple buttercream, I added a thin layer of white buttercream on top and dragged a toothed cake comb around it so that the purple shown through in each line. With a purple and white marbled and piped trim and completed with a large ombre purple flower dusted lightly with pearl dust, she loved the whole thing.