To make the dressing, combine the herbs in a food processor and pulse several times to mince. Add the mayonnaise and process until blended and smooth. Add the buttermilk, lemon juice, pepper, and salt. Pulse once or twice to blend well.
For the salad, arrange equal portions of the lettuce in the center of individual salad plates. Arrange equal amounts of the turkey, ham, cheese, and tomato wedges around the lettuce. Top each salad with some of the chopped egg and serve immediately. Serve the salad dressing on the side.
YIELD: 4 large or 6 to 8 side salads