The recipe is calculated for a 26 cm springform pan.
First, mix the pieces of rhubarb in a bowl with 1 tablespoon of sugar while the dough is being prepared.
Mix the margarine or butter with 180 g sugar and the vanilla sugar until soft, add the egg, beat until frothy. Add eggnog and milk, stir well. Fold in the flour and baking powder.
Fill everything into the mold, distribute the rhubarb pieces on top and bake at 170 ° for about 50 minutes (test with chopsticks).