For the dough, mix all the ingredients in a bowl to form a dough and spread on a greased, floured sheet.
Bake in a preheated oven at 170 ° C for approx. 15 minutes (must not be fully baked).
For the topping, do not beat the egg whites until stiff. Slowly pour in the fine sugar and vanilla sugar and whisk until done. Fold in the currants and spread the topping on the slightly baked dough. Bake for another 5 to 10 minutes.