Stir the fat with the whisk of the hand mixer until it becomes light. Add 100 g icing sugar, salt and vanillin sugar and stir until frothy. Stir in egg, lemon peel and ginger.
Mix flour and cocoa and gradually stir into the fat mass. Pour the dough into a piping bag with star-shaped spout and squirt curls (approx. 7 cm Ø) onto a baking tray lined with baking paper.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 15 minutes in succession. Cool down on a cake rack. Dust with remaining icing sugar. Makes approx. 25 pieces.