Tear the little gem leaves and place them in a large bowl. Add the tarragon, dill, and celery leaves.
In a small bowl, whisk together the sherry vinegar, honey, a large pinch salt, and pepper to taste. Whisk in the oil. Drizzle some of the vinaigrette over the lettuce and herbs and toss to coat.
Place the salad on an oval platter, drizzle with more dressing if needed, and sprinkle with hazelnuts. Serve immediately.