Vichyssoise-Potato Leek Soup
["4 c. leeks, cut up (white only)", "1 stalk celery, chopped", "1 onion, chopped", "9 potatoes, peeled and sliced", "1 stick butter", "7 c. chicken broth", "few sprigs parsley"]
["Saute leeks, onion and celery in butter.", "Add chicken broth, potatoes and parsley.", "Bring to a boil and simmer until potatoes are soft (about an hour).", "Add salt and pepper to taste and a few drops of Worcestershire.", "Put soup through processor.", "Before serving, heat through.", "Add about 1/2 cup cream or milk.", "Sprinkle chives on top."]
["leeks", "celery", "onion", "potatoes", "butter", "chicken broth", "parsley"]