Vichyssoise
["3/4 lb. leeks, well washed, halved lengthwise and thinly sliced", "1 medium onion, chopped", "2 Tbsp. butter", "2 large potatoes, peeled and diced", "3 c. chicken stock", "salt to taste", "2 c. light cream", "dash of Tabasco sauce", "1 c. plain yogurt", "chopped chives"]
["Heat leeks and onion in butter in large skillet until transparent; do not brown.", "Add potatoes, stock and salt; simmer until potatoes are tender, about 30 minutes.", "Pour into blender; puree.", "Stir in cream and Tabasco.", "Strain through sieve (this is optional; I do not strain); chill.", "Just before serving, stir in yogurt; re-adjust seasoning.", "Serve very cold; garnish with chives.", "Serves 6."]
["leeks", "onion", "butter", "potatoes", "chicken stock", "salt", "light cream", "Tabasco sauce", "plain yogurt", "chives"]