The clean flavors of a green salad work perfectly alongside heavier dishes, or it can be served as a separate course.
For the dressing:
Place all the ingredients in a thoroughly clean glass jar. Screw on the lid and shake to combine. Refrigerate until ready to use.
For the salad:
Separate the lettuce leaves, discarding the outer leaves and the stalks. Wash the leaves thoroughly and gently dry in a salad spinner. Place in a large bowl with the fennel. Just before serving, toss the salad with the dressing.