You can use any combination of fresh herbs you wish here. The points to remember are (1) only the leaves should be used; (2) they should be well minced; (3) avoid using large quantities of the strong-flavored herbs, such as rosemary, sage, or thyme. Choose milder-flavored ones, like parsley, basil, or dill. You want the mayonnaise to be fragrant, not pungent.