How to Make It
Grate dark chocolate; set aside. Heat milk, 4 tablespoons unsweetened cocoa, and superfine sugar in a pan. Remove from heat. Add grated chocolate, and whisk quickly for at least 2 minutes. When mixture is frothy, pour into 4 large cups, and sprinkle with a little cocoa, if desired; serve immediately.
Chocolat, Octopus Books, 2008