1/4 cup chilled whipping cream
2 tbsp brown sugar, divided
1 tbsp Grand Marnier or other orange liquer
4 cups whole milk
6 oz bittersweet (not unsweetened) chocolate, chopped
3 tbsp instant espresso powder
1 tbsp unsweetened cocoa powder
Ground coffee beans (optional)
Whisk cream, 1 tbsp sugar and Grand Marnier in medium bowl to soft peaks; cover and chill.
Using vegetable peeler, remove peel from oranges in strips; add strips to medium saucepan (reserve oranges for another use). Add milk; bring just to simmer over medium heat. Add chocolate, espresso powder, cocoa powder and remaining 1 tbsp sugar; bring just to simmer, whisking to melt chocolate. Strain. Ladle mocha into four mugs. Top with whipped cream and ground coffee beans, if desired.