In a small saucepan, heat milk, half-and-half, orange peel and lemon peel until just simmering, simmer for about 2 minutes to infuse citrus flavor, being careful not to boil. Remove peel, add chocolate, whisking until melted. Add brandy and/or limoncello, to taste.
Serve in mugs with a dollop of whipped cream.
Yield: 2 servings