INGREDIENTS
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2 teaspoons vanilla extract
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1/2 teaspoon espresso powder
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1/2 cup sugar
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3 tablespoons cocoa powder
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2 tablespoons cornstarch
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1/4 teaspoon salt
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3 large egg yolks
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1/2 cup heavy cream
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2 1/2 cups whole milk
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5 tablespoons butter
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4 oz bittersweet chocolate, chopped fine.