In a bowl whisk together flour, grounded almonds, starch flour.

Divide eggs and beat the egg whites until stiff. In another bowl mix butter and sugar until well combined and creamy. Add the egg yorks one after another. Now sift the flour all over the mix and mix until there are are no more flour clusters, now add the rum. At last slowly add the egg whites.

Preheat oven to top heat (very important that the heat comes only from above!) on 200-250°C. Oil a baking pan. Take 2 tablespoons of the dough and pour into the pan. Now bake for 2-4 minutes (until it slightly turns golden brown). Remove form oven and add the next layer, again by pouring 2 tablespoons on top of the already baked layer. Continue with this process with the rest of the dough. I got 25 layers.

When you are all done with the batter remove from oven and let it cool. Remove from baking pan. Melt chocolate and coconut oil over a waterbath and decorate cake as you like with more chocolate or sprinkles.