Mix the butter with 300 g sugar and vanilla sugar until smooth. Gradually stir in the eggs, peel of one orange, peel of 1/2 lemon, wheat flour, cornstarch and baking powder.
Pour the dough into a greased bowl and bake at 175 ° C - 200 ° C in a preheated oven for about 1 hour.
When the cake has cooled, turn it out and return it to the cleaned pan. Then prick several times with a wooden stick or something similar.
Mix the orange juice with 1 tablespoon of lemon juice, peel of one orange, peel of 1/2 lemon and 100 g of sugar. Pour half of the juice over the cake. Turn the cake out again, pierce it several times and pour over the remaining juice.
This cup cake is very moist, lasts for several days and is also extremely popular with children!