I first discovered this Australian treat, classically called a Lamington, when I was in Japan. It was a snack left for me in my hotel room, and I was blown away. Cubes of super moist white cake are glazed in chocolate. Once the glaze is set, it helps hold the fragile cake together, and the whole thing just melts in your mouth.
These cakes hold well for 3 days at room temperature, well covered.