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
1 large red bell pepper, finely diced
½ cup finely chopped red onion
½ cup chopped fresh parsley, divided
4 teaspoons capers, rinsed
1½ 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