Preheat the oven to 450 degrees. Arrange the chopped potatoes on a baking sheet. Drizzle with the 1 tablespoon olive oil and toss with the garlic and pinches of salt and pepper. Roast in the oven for 20 minutes, or until golden brown and crunchy on the edges.
Meanwhile, make the dressing: Whisk together the shallot, Dijon, lemon juice, olive oil, parsley, dill, and pinches of salt and pepper. Taste and adjust seasonings.
When the potatoes are done, assemble the salads with the greens, green beans, chickpeas, tomatoes, eggs, pickles, capers, and potatoes.
Serve the dressing on the side, or toss salad greens together with the dressing, green beans, chickpeas, potatoes, and tomatoes and then top salad with the eggs, gherkins, and capers.