For the vanilla sauce, scrape out the vanilla pod. Stir the pulp of the vanilla bean with the remaining ingredients with 2 – 3 tablespoons of the milk until smooth.
Bring the milk to the boil in a saucepan with the remaining vanilla bean. Add the smooth mixture to the milk and let it simmer for a while so that the starch can bind with the milk.
Stir again and again. Enough for 2 – 4 servings.