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Add 2 teaspoons of salt to the same cooking liquid and bring the liquid to a simmer. Add the potatoes to the simmering liquid and cook until they are just tender but still hold their shape, about 8 to 10 minutes. Transfer the potatoes to the ice water to cool completely. Drain the potatoes and pat dry with a towel.
In a small bowl, whisk the lemon juice, garlic, oil, oregano, 1 teaspoon salt and 3/4 teaspoon pepper. Place the tomatoes, basil and parsley in a large serving bowl. Add the tuna and toss gently to combine. Add the green beans and potatoes and gently combine. Pour the dressing over the salad and toss to coat.