Vichyssoise is a cold potato and leek soup that is typically served with a dollop of sour cream or crème fraîche.
Melt butter; add onion, celery, and leeks; cook 20 minutes.
Place insauce pan; pour in broth; add potatoes; bring to boil and reduce heat tosimmer.
Simmer until potatoes are soft.
Puree soup; add soy sauce.
Chill; stir in cream.
Reseason if necessary; garnish with chives toserve.
Serves 4 .