Recipes often call for just the white portion of the Leek. Feel free to forego the green parts if desired. They are generally a little tougher and more fiborous but when well cooked and pureed you'll never notice.
Julia Child's Leek & Potato Soup is made without broth or stock, just water. The color of the soup will be white instead of the darker stock based version posted here.
This soup is vegetarian friendly.
Take care when pureeing hot soups. If you don't have a stick/immersion blender, use a regular blender pureeing the soup in batches.
Inspired by several recipes from Julia Child, Robert Irvine and Belinda Williams