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1
Slice three of the leeks.
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2
Julienne the fourth, and set it aside.
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3
Melt the butter in a large saucepan, add the sliced leeks and onion, cover and cook over low heat, stirring from time to time, until the vegetables are very soft but have not colored.
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4
Add the potatoes and chicken stock.
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5
Cover, and simmer about 15 minutes, until the potatoes are soft.
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6
Puree the leek and potato mixture in a food processor, and return it to the saucepan.
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7
Stir in the milk and cream, and bring the soup to a simmer.
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8
Season the soup with salt, and keep it at a low simmer.
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9
Mix the cloves, cinnamon, cardamom, pepper and nutmeg together, and set aside.
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10
Heat the oil in a small deep pan until it is very hot but not smoking.
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11
Add the julienned leek, and cook until it is golden brown.
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12
Remove it with a slotted spoon to several thicknesses of paper towel to drain.
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13
Sprinkle it with 1/4 teaspoon of the spice mixture and a good pinch of salt.
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14
Sift the remaining spice mixture onto the soup through a fine strainer.
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15
Lightly swirl in the spices without thoroughly incorporating them, so that there are streaks of spice.
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16
Divide the hot soup among four dishes, top each with the spiced leeks, and serve.