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For custard: Place cream in heavy, medium saucepan.
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Bring to simmer and remove from heat.
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Add vanilla extract and chocolate and stir until chocolate is melted and mixture is smooth.
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Whisk egg yolks and sugar in medium bowl to blend.
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Slowly whisk in hot chocolate cream.
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Let cool to room temperature, stirring occasionally, about 15-20 minutes.
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Position rack in center of oven and preheat to 300F.
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Arrange six ½ cup ramekins or custard cups in shallow baking pan.
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Divide cooled chocolate mixture among them.
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Pour enough hot water into baking pan to come halfway up sides of ramekins.
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Bake until custards are just set, about 40 minutes.
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Cool custards on racks (can be prepared 1 day ahead; cover tightly and refrigerate).
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For topping: Preheat broiler.
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Mix sugars together.
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Sprinkle over custard in an even layer.
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Place ramekins on a baking sheet.
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Broil 2 inches away from heat source just until sugar melts and begins to caramelize.
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Let stand 5 minutes before serving.