Beat eggs, sugar and vanilla sugar until frothy. Then gradually add the remaining ingredients and work into a batter. Spread the dough on a parchment-lined baking sheet.
Bake in a preheated oven at 150 ° C - 180 ° C for about 25 minutes. Let the cake cool down.
Now mix the butter with the coffee and cocoa powder and spread it on the cake. Now sprinkle the whole thing with desiccated coconut and cut into triangles.