Mix butter, sugar, vanilla sugar and lemon zest for approx. 10 minutes until creamy. Stir in the egg yolks one at a time. Mix the flour, baking powder and pudding powder, sieve and stir in alternately with the milk. Fold in the egg whites.
Place blobs about 6 cm in diameter on 2 baking sheets lined with baking paper, but not more than 7 pieces per sheet. Bake in the oven preheated to 175 ° C for 10 - 20 minutes. For the icing, mix together powdered sugar, water and lemon juice and spread on the cooled Americans.