INGREDIENTS
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1 1/2 cups sugar
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3/4 cup cocoa powder (preferably Dutch-processed)
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1/2 cup cornstarch
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1/8 teaspoon (heaping) kosher salt
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4 cups whole milk
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2 cups half-and-half
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3 ounces bittersweet chocolate
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1 tablespoon vanilla extract
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3 ounces white chocolate, chopped
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Whipped cream, for garnish