Creamy Basil Dressing

1/2 cup mayonnaise
1/2 cup chopped scallions, whites and green parts
1/2 cup chopped fresh basil
2 fresh squeezed lemons
1 teaspoon lemon zes
2 garlic clove, minced
2 teaspoons salt1 teaspoon pepper1 cup sour crea
Place, mayonnaise, scallions, basil, lemon juice, garlic, salt and pepper in a blender. Blend until smooth. Add sour cream and blend until blended. Serve immediately or refrigerate