For the dressing
1 ripe avocado, peeled, seeded, chopped
1Ú2 cup fat-free mayonnaise
1Ú2 cup plain nonfat yogurt
3 tablespoons white balsamic or white-wine vinegar
1 shallot, chopped
3 tablespoons chopped fresh flat-leaf parsley leaves
3 tablespoons chopped fresh chives
3 tablespoons chopped fresh tarragon
1Ú2 teaspoon salt
1Ú2 teaspoon white pepper
1Ú4 cup water
Place all ingredients except water in blender jar or food processor. Turn machine on, and through feed tube or opening, gradually pour water. Turn machine off as needed to scrape sides with rubber spatula. Blend until all ingredients are incorporated and mixture is creamy. Transfer to glass bowl or jar.
Makes about 13Ú4 cups dressing.
