Ina Garten's Green Goddess Dressing
In a good blender place the mayonnaise, chopped scallions, basil, freshly squeezed lemon juice, garlic cloves, anchovy paste, kosher salt, and pepper. Blend until smooth. Throw in the sour cream and process until just blended. Refrigerate until ready to use.
This recipe is good for one quart of Green Goddess Salad Dressing. I recommend storing it in a wide mouth quart size mason jar.