Heat the milk in a saucepan. Separate the vanilla pod long ago, scrape it out and add the pulp along with the cinnamon and sugar. Bring the whole thing to a boil while stirring. Then reduce the heat - the milk should no longer boil. Now add the applesauce and egg liqueur. Stir well and let it steep for about 10 minutes over a low heat.
Fill six tall cups 3/4 full and garnish with whipped cream.
Tip: Sprinkle with a pinch of cinnamon and sugar if necessary.