INGREDIENTS
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2/3 cup sugar
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1/3 cup unsweetened Dutch-process cocoa (spooned and leveled)
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1/4 cup cornstarch
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1/4 teaspoon salt
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2 1/2 cups whole milk
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4 large egg yolks
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2 tablespoons unsalted butter
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1 teaspoon pure vanilla extract
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4 ounces bittersweet chocolate, chopped, plus shavings