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In a heavy saucepan, slowly heat the milk with the vanilla bean; do not boil or the milk will curdle.
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Remove and split the bean, scrape out the seeds, and return them to the milk.
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Preheat oven to 350 degrees.
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Meanwhile, whisk the eggs, egg whites, sugar, potato starch and vanilla.
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Slowly whisk this mixture into the hot milk.
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Cook over low heat, stirring with a wooden spoon, until the custard coats the back of the spoon.
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Divide the custard into eight 6-ounce ramekins.
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Place the ramekins in a baking dish with 2" sides.
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Pour hot water into the baking dish, until the water comes halfway up the sides of the ramekins.
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Place the baking dish in the oven and bake for 35 to 40 minutes, or until a knife inserted in the center comes out clean.
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Remove the ramekins from the dish and place them on a rack to cool.
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Refrigerate until well chilled, about 2 hours.
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Preheat the broiler.
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Sprinkle each custard lightly with brown sugar, spreading it evenly to the edges.
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Place the ramekins on a baking sheet and broil for about 1 minutes, until the sugar is melted and bubbly.
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Watch carefully.
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Remove and serve immediately, or chill until served.