Knead butter in pieces, 75 g sugar, flour, cinnamon, vanilla sugar and egg first with the dough hooks of the hand mixer, then with your hands to a smooth dough. Wrap the dough in foil and chill for about 30 minutes.
In the meantime, bring wine and orange juice to the boil. Add the mulled wine seasoning and let it steep for 3-5 minutes, depending on taste. Remove the mulled wine seasoning. Boil up the juice mixture. Stir in jelly powder and 175 g sugar and let it boil for another 3-5 minutes. Let cool off.
Roll out the dough on a floured work surface to a thickness of about 2 mm. Cut out approx. 36 hearts (approx. 9 cm Ø), if necessary pierce holes with a wooden skewer to hang them up. Cut out half of the hearts with a small heart cutter (approx. 3 cm Ø). Place the biscuits on two baking trays lined with baking paper and bake them one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 8-10 minutes. Let them cool down.
Heat the jelly again and spread on the uncooked hearts. Dust the remaining hearts with icing sugar and place on top. Leave to dry. If necessary, pull a ribbon through the hole.