1. Whisk together shallot, capers, Dijon, vinegar, salt, and pepper. Slowly whisk in oil; set dressing aside.

2. Fill a large bowl with ice and water; set aside. Bring a saucepan of water to a boil. Add green beans, and cook until bright green, about 1 minute. Drain; plunge into ice water to stop cooking. Drain again, cut into 1 1/2-inch pieces, and set aside. Refill saucepan with cold water, and add potatoes. Bring to a boil, reduce to a simmer; cook until potatoes are tender, about 15 minutes. Drain potatoes; let cool slightly. When cool enough to handle, cut potatoes into 1-inch pieces. Place in a bowl; toss with 1/4 cup of the vinaigrette; set aside. Place eggs in a small saucepan of cold water. Bring to a boil; cover. Remove from heat. Set aside for 11 minutes. Rinse in cold water; peel; cut into wedges; set aside.

3. To assemble, arrange lettuce on individual plates. Arrange green beans, potato salad, sliced eggs, celery, tomatoes, radishes, tuna, olives, and anchovies, if using. Drizzle with remaining dressing, and serve.