Mix butter with icing sugar, vanity sugar and egg yolks until creamy, stir in liqueur and flour (mixed with cornstarch and baking powder), finally fold in the egg whites, spread on a baking sheet lined with baking paper approx.
Streusel: Mix butter with flour and sugar and pour over the fruit
crumble.
Bake at 150 ° convection for about 45 minutes
When cold, sprinkle with icing sugar / eggnog glaze: 60 grams of icing sugar with 2 tablespoons. Mix the eggnog well.