50 grams butter
600 grams peeled, diced potatoes
400 grams white of leek, sliced
3 cups chicken stock
250 ml cream
...
300 grams watercress
salt to taste
Saute leeks in butter until soft. Stir in patotoes and cook for 5 minutes. Add chiicken stock and simmer until cooked for about 45 minutes. Add watercress and simmer for 5 minutes. Add cream and liquidise. Season to taste. Chill well and serve with sprigs of watercress.