INGREDIENTS
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4 small red potatoes (about 1/2 pound)
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1/3 pound fresh green beans, trimmed
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12-ounce can light tuna packed in water, drained
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1/2 cup chopped pitted Greek or Spanish olives
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1/4 cup diced red onion
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2 large tomatoes, seeded and diced (about 2 cups)
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5 cups chopped romaine lettuce
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2 tablespoons olive oil
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1/4 cup freshly squeezed lemon juice
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1/2 teaspoon Dijon mustard
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Salt and pepper