Mediterranean Tuna Antipasto Salad

Name: Mediterranean Tuna Antipasto Salad
Ingredients: 1 15- to 19-ounce can beans, such as chickpeas, black-eyed peas or kidney beans, rinsed; 2 5- to 6-ounce cans water-packed chunk light tuna, drained and flaked (see Note); 1 large red bell pepper, finely diced; ½ cup finely chopped red onion; ½ cup chopped fresh parsley, divided; 4 teaspoons capers, rinsed; 1 ½ teaspoons finely chopped fresh rosemary; ½ cup lemon juice, divided; 4 tablespoons extra-virgin olive oil, divided; Freshly ground pepper, to taste; ¼ teaspoon salt; 8 cups mixed salad greens