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Previous birthday cakes have been cartoon characters that can be made easily using coloured buttercream on a flat shaped cake, but this one required some 3-dimensional construction.
I piled up rectangular layers of chocolate sponge cake stuck together with blueberry fruit spread - it's less sweet than jam - and then carved out the oval shape of the Ohmu.
After a skim coating of chocolate buttercream to smooth over the cake edges and give something for the outer layer to adhere to, it needed some brown rollable icing to make the carapace plates. Stick on some glace cherry halves for eyes, and add the legs at the front.
Now, commercial fondant icing is all very convenient and available in many colours. BUT IT TASTES HORRIBLE. A cake decorated with it may look pretty, but your guests will be quietly peeling the icing off before they eat. So I went looking for a recipe to make a rollable chocolate-flavoured icing. And discovered a new cake decorating wonder material!
All it takes is TWO ingredients.