2 lb leeks, cleaned and sliced thin, including 1" of green top
2  onions, peeled and quartered
9 cups  chicken broth or stock
4 lbs potatoes, peeled and cubed
Black pepper
 
  Sate the leeks in a bit of oil. Put the leeks, onions and broth in a pot. Bring to a boil. Reduce the
  heat; cover. Simmer. Add the potatoes; return to a boil. Cover and simmer until the potatoes are
  tender. Process in a blender until smooth. Stir in the pepper.
Potato Leek Soup