Have ready a 3-cup bowl or mold or four 5- to 6-ounce cups or ramekins. Whisk together in a medium heavy saucepan:
Whisk in gradually:
Cook over medium heat, stirring occasionally, until the mixture comes to a simmer, and continue to cook for 1 minute. Remove from the heat and stir in:
Stir until the chocolate is completely melted. Finish and store as for Vanilla Pudding.