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Remove the outer leaves of the leeks and wash thoroughly (they often have some dirt just inside the outer leaves). Cut off the root and finely slice (white part to just where it starts to turn green). |
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Over low heat, cook the sliced leeks and sliced onion in butter until soft, but not browned. |
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Add the chicken broth and potatoes and cook, covered, until the potatoes are tender, about 20 minutes. |
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Puree in a blender in batches. Then pour in the milk and cream and season to taste with salt and pepper. |
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| Chill thoroughly. Serve cold with finely chopped chives. |