Knead butter in flakes, sugar, flour, egg yolk, vanillin sugar and grated orange peel to a smooth dough. Wrap in foil and chill for about 30 minutes. Roll out to a thickness of approx. 5 mm on a floured work surface. Cut out different stars and place them on 2 baking trays lined with baking paper. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 8-10 minutes.
Then allow to cool. Stir icing sugar and orange juice until smooth. Colour half of it orange. Decorate the biscuits with the icing and sugar pearls. Let them dry and dust with icing sugar