Green Goddess Dressing
["1 c. mayonnaise", "5 to 6 anchovy fillets", "2 small scallions (green tops included)", "1 Tbsp. loosely packed parsley leaves", "1 tsp. tarragon leaves (1/2 tsp. dried)", "1 Tbsp. snipped chives", "2 tsp. tarragon vinegar", "1/2 c. sour cream"]
["Place mayonnaise in blender container.", "Add next six ingredients and blend on high speed until smooth.", "Add sour cream and blend on low speed until mixed.", "Makes about 1 1/2 cups."]
["mayonnaise", "anchovy", "scallions", "parsley", "tarragon", "chives", "tarragon vinegar", "sour cream"]