INGREDIENTS
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2 tablespoons unsalted butter, room temperature
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1/3 cup granulated sugar, plus more for ramekins
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3 large egg whites, room temperature, plus 3 large egg yolks
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1/8 teaspoon cream of tartar
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5 1/2 ounces bittersweet chocolate (70 percent cacao), melted
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2/3 cup whole milk
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1 tablespoon plus 1 1/2 teaspoons cornstarch
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1/8 teaspoon salt
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3 tablespoons creme fraiche or sour cream
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Garnish: confectioners' sugar, for dusting