Put the cinnamon, cloves, star anise, cardamom and allspice in a tea filter and seal, put the mulled wine, orange juice and sugar in a saucepan with the spices and the pulp of the vanilla pod, bring to the boil and reduce the liquid to 250 ml. Stir occasionally and remove the spices just before the right amount is reached.
You can see the transition from liquid to syrupy, the liquid no longer boils in a flowing manner, but rather many small bubbles form. At this moment, take the pot off the stove
Measure the syrup, pour it into a clean bottle, fill up with vodka and let it steep for another week in a dark place. But for those in a hurry, the liqueur is also immediately drinkable.
Leftovers of the syrup can also be used for ice cream or pudding.