INGREDIENTS
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2teaspoons vanilla extract
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1/2teaspoon espresso powder
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1/2cup (3 1/2 ounces) sugar
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3tablespoons Dutch-processed cocoa
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2tablespoons cornstarch
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1/4teaspoon salt
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3large egg yolks
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1/2cup heavy cream
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2 1/2cups whole milk
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5tablespoons unsalted butter, cut into 8 pieces
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4ounces bittersweet chocolate, chopped fine