In a medium sauce pot, heat the milk over medium heat until just about to simmer.
Chop chocolate, and add to pot.
Whisk until the chocolate dissolves. Be careful not to overheat the milk.
Remove the pot from the heat and froth with a molinillo, hand blender, or blender.
Serve while hot and frothy.
You can find several flavors of Taza Chocolate Mexicano, use your favorite.