Place the chocolate chunks in a blender and pulse several times until broken into small pieces. Or grate by hand. Meanwhile, bring the milk to boil in a small pot. Pour the hot milk over the chocolate, cover (with the vent open) and blend until thoroughly combined and frothy. Or whisk with a whip for 3 minutes. Serve immediately.
c.1996, M.S. Milliken & S. Feniger, all rights reserved