Cream butter. Sift icing sugar finely. Mix with flour, cornstarch and vanilla pulp, stir into the butter. Add 1-2 tablespoons of ice-cold water, knead well and cover and chill for about 30 minutes.
Form approx. 38 cherry-sized balls from the dough and place them on 2 baking trays lined with baking paper. Press them slightly flat with a lightly floured fork. Bake the trays one after the other in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 12 minutes. Let the biscuits cool down on a cake rack and dust with icing sugar