Whisk sugar and cocoa in a small heavy saucepan. Gradually whisk in milk until a smooth paste forms. Bring to a simmer, whisking constantly. Reduce heat to low and simmer, whisking constantly, for 4 minutes. Remove from heat and add chocolate; stir until melted. Stir in orange-poaching syrup (or orange liqueur). Let cool.Advertisement
Make Ahead Tip: The sauce will keep, covered, in the refrigerator for up to 2 weeks.
1/2 other carbohydrate