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In a large saucepan, boil cabbage until tender; remove and chop or blend well.
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Set aside and keep warm.
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Boil potatoes until tender.
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Remove from heat and drain.
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Chop leeks, green parts as well as white, and simmer them in just enough milk to cover, until they are soft.
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Season and mash potatoes well.
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Stir in cooked leeks and milk.
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Blend in the cabbage and heat until the whole is a pale green fluff.
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Make a well in the center and pour in the melted butter.
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Mix well.