Tuna and Green Bean Salad

Name: Tuna and Green Bean Salad
Ingredients: 1 1/2 pounds slender green beans, trimmed, halved crosswise; 3 teaspoons salt, plus more to taste; 2 large red potatoes, diced; 1/3 cup freshly squeezed lemon juice; 2 garlic cloves, finely chopped; 1/3 cup extra-virgin olive oil; 1 teaspoon dried oregano; 3/4 teaspoon freshly ground black pepper; 8 ounces cherry tomatoes, halved; 1/2 cup chopped fresh basil leaves; 1/4 cup chopped fresh Italian parsley leaves; 9 ounces canned tuna packed in oil, drained