Chopped Nicoise Salad

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4 small red potatoes (about 1/2 pound)

1/3 pound fresh green beans, trimmed

12-ounce can light tuna packed in water, drained

1/2 cup chopped pitted Greek or Spanish olives

1/4 cup diced red onion

2 large tomatoes, seeded and diced (about 2 cups)

5 cups chopped romaine lettuce

2 tablespoons olive oil

1/4 cup freshly squeezed lemon juice

1/2 teaspoon Dijon mustard

Salt and pepper