Assemble all ingredients in the kitchen approx. 1 hour beforehand.
Sieve the flour and baking powder well. Finely chop the orange peel and lemon peel.
Beat the butter, sugar, vanilla sugar and eggs with the whisk until frothy. Add milk, cocoa and gingerbread spice, stir well. Add flour and mix everything well with a wooden spoon, add the orange peel and lemon peel to create a viscous dough. The dough is spread evenly on a greased baking sheet and baked in a preheated oven at 180 degrees for 25 minutes.
After baking, spread hot apricot jam and glaze with icing sugar and egg white.
The cake is cut open as rectangles, diamonds or squares, preferably always eaten on the same day.