Nun'S Revenge

Directions

1. 1
   In a small bowl, combine 2 tablespoons of the half-and-half with the arrowroot, whisking until smooth.
2. 2
   Place the remaining 1/2 cup of half-and-half in a small saucepan over medium heat.
3. 3
   Bring to a simmer and when the half-and-half begins to bubble around the edges, whisk in the sugar.
4. 4
   Whisk in the arrowroot mixture until the half-and-half thickens slightly, usually less than a minute.
5. 5
   Remove from the heat and quickly whisk in the chocolate until smooth.
6. 6
   Pour into cups, top each with a piece of orange zest, and serve immediately.