You can make this simple and rich chocolate cake whenever you want it in just 15 minutes! All you need to cook it is a silicone steamer (Lekué) and a microwave.
I didn't have time to bake a cake so I tried steaming one in a silicone steamer in the microwave. It turned out rich and delicious so I uploaded the recipe here.
I think I have a bit too much mixture to mix this together in a small Lekué steamer so I mixed the batter in a separate bowl.
Enjoy Japanese food around the world.