Green Goddess Dressing I have become obsessed with this condiment that can be used as a sandwich spread or, thinned slightly, as a salad dressing. 3/4 cup mayonnaise 1/4 cup sour cream (I use a nondairy sour cream) 1 bunch flat leaf parsley, chopped 5 scallions, chopped 1  Tbsp. fresh tarragon leaves, chopped 2 tsp. anchovy paste 3 Tbsp. white wine vinegar or tarragon vinegar if you can find it 1 tsp. Dijon mustard 2 garlic clo