Preparation Whisk cream, 1 tablespoon 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 tablespoon sugar; bring just to simmer, whisking to melt chocolate. Strain. Ladle mocha into 4 mugs. Top with whipped cream and ground coffee beans, if desired.
Preparation Whisk cream, 1 tablespoon 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 tablespoon sugar; bring just to simmer, whisking to melt chocolate. Strain. Ladle mocha into 4 mugs. Top with whipped cream and ground coffee beans, if desired.