Nutrition per serving may change if servings are adjusted.
1/2 cup packed light brown sugar
1/3 cup unsweetened cocoa powder
3/4 cup 1% milk
2 ounces bittersweet or semisweet chocolate, chopped
1 tablespoon orange liqueur
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.
Make Ahead Tip: The sauce will keep, covered, in the refrigerator for up to 2 weeks.