In a blender, combine yogurt, mayo, lemon, basil, green onion, garlic, salt, black pepper, anchovy paste (optional). Blend until combined. Serve over romaine leaves and tomato wedges. Season with coarse black pepper before serving.
Recipe by Nutritious Eats at https://www.nutritiouseats.com/romaine-wedge-salad-with-green-goddess-dressing/