Knead the flour, sugar, vanilla sugar, cinnamon, egg and butter into a smooth dough. Wrap in foil and put in the refrigerator.
Preheat the oven.
Knead the dough again briefly and roll out on a floured work surface. Cut out cookies and bake on a baking sheet lined with baking paper for about 6 - 7 minutes. Then let it cool down.
Warm the couverture in a water bath. Cover half of the cookies with couverture. Garnish with chopped plum and almond.
Brush the other half of the cookies with the Christmas jam and put together with a glazed cookie.