First melt the couverture in a water bath (if you grate it roughly beforehand, it will be faster). At the same time, slowly warm the milk in a separate saucepan. When the couverture is completely melted, add a shot of the warmed milk and stir vigorously (this is best done with a whisk). When the couverture is completely dissolved, add the mixture to the rest of the milk and stir. Now scrape out half a vanilla pod and add the seeds. Also delicious: a small shot of Bailey`s with it.