INGREDIENTS
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1/4 cup sugar
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1/4 cup cornstarch
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2 tablespoons unsweetened cocoa powder
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pinch kosher salt
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2 cups whole milk
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4 large egg yolks
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2 tablespoons unsalted butter, cut into pieces
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3 ounces semisweet chocolate, chopped
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1 teaspoon pure vanilla extract
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whipped cream, for serving