Combine 3/4 cup mayonnaise, 3/4 cup sour cream, 1/4 cup fresh lemon juice and 4 finely minced anchovies in a bowl. Mince 1/4 cup parsley and 1 clove garlic and add to dip. Thinly slice 2 tablespoons each scallions and fresh chives and add to dip. Add 2 teaspoons dried tarragon or 2 tablespoons fresh tarragon. Salt and pepper to taste. Combine well.

Cover and refrigerate for several hours before serving with vegetables or chips.