Cream butter, vanilla sugar and sugar with the whisk of the hand mixer. Add egg and orange peel. Stir in flour and starch. Form the dough into walnut-sized, smooth balls. Line 2 baking trays (32 x 39 cm) with baking paper. Place balls on top
Warm the jelly slightly and stir (do not let it become liquid!). Press a hollow into the centre of each ball with a round stirring spoon handle and fill it with jelly almost to the brim. Bake the trays one after the other in a preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 12 minutes on the 2nd rack from below. Remove and let cool on a cake rack