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Parboil the onions with their skins on for a minute.
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Immediately rinse with cold water.
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Slice off the root end and squeeze the onions out of their skins.
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Return the onions to the saucepan and simmer in enough water to cover for 10 minutes, until they are tender.
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Drain the onions and leave in the colander for a minute.
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In the same saucepan melt the butter.
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Add the flour and mix well.
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Stirring constantly, pour the cream in very slowly.
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Cook the sauce over medium heat, stirring constantly until the sauce thickens.
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Add the spices and the onions and cook just until the onions are reheated.
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Pour into a serving dish and sprinkle with additional nutmeg if desired.