Prepare the leeks: wash the whole leek, then as you slice it, throw the slices into a big bowl of cold water. There's often more dirt inside the first few layers of leek, and this will get it out. Lift the clean pieces out and put on a cloth or paper towel to soak up excess water.
Ingredients
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2 tablespoons (1/4 stick) butter, or olive oil, or 1 tbsp of each
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3 cups sliced leeks (white and pale green parts only)
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[optional: sliced fennel bulb]
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6 cups water or broth
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2 pounds potatoes, cut into 1/2-inch pieces
Preparation
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Heat oil/butter in heavy large pot over medium-high heat.
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Add leeks [and fennel if using] and sauté until leeks are translucent, about 7 minutes.
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Add broth and potatoes and bring to boil. Reduce heat to medium-low.
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Simmer soup until potatoes are very tender, about 15-20 minutes.
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Working in batches, purée soup in blender (if you have a hand blender, you can stick it right into the pot). Return to same pot & stir. Season with salt and pepper & serve.