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.
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Serve in mugs with a dollop of whipped cream.
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Yield: 2 servings