3 tuna niecoise salad with roasted green beans and potatoes Recipes

potatoes , such as red bliss or fingerling (about 9), halved, green beans, trimmed, olive oil, divided, salt, divided, pepper, divided, fresh lemon juice, capers, rinsed, chopped parsley, head oak leaf lettuce (about 12 loosely packed cups), tuna in olive oil, drained, olives , such as oil-cured or kalamata, pitted and halved, halved grape tomatoes (about 7 oz), eggs

red potatoes, fresh green beans, trimmed, dry white wine, white wine vinegar, divided, canned low-sodium chicken broth, undiluted, capers, drained, dijon mustard, dried thyme, olive oil, sugar, mixed baby salad greens, roasted red peppers, drained and cut into thin strips, low-sodium chunk light tuna in water, drained, pitted ripe olives, sliced, hard-cooked egg whites, chopped