In a saucepan, combine the water and cinnamon stick. Bring to a boil, reduce heat, add chocolate and stir until chocolate dissolves.
in a small bowl, whisk the cornstarch with 1/4 cup of milk until smooth, set aside.
To the chocolate mix in the 1 cup of milk. Raise heat slightly and stir well to combine. Right before the milk comes toa boil, whisk in the cornstarch slurry, making sure there are no lumps in the slurry. Whisk until smooth into the chocolate. Reduce heat and cook for a few more minutes or until it becomes thick. Serve warm. Yields 4 servings(6 oz.