Place all ingredients except for oil in a blender. Process until well blended. With machine running, gradually add oil through the feed tube in a steady, slow stream. Blend well. Transfer to a bowl, cover and refrigerate. Can be prepared 3 days ahead. So good on fish, hamburgers, and also can also be used for tuna salad, chicken salad, pasta salad, or potato salad.
Recipe by The Culinary Cellar at https://theculinarycellar.com/fresh-herb-mayo/