Chicken and Asian Noodle Salad

Name: Chicken and Asian Noodle Salad
Ingredients: 5 tablespoons rice wine vinegar; 2 tablespoons white or yellow miso; 1/4 teaspoon sesame oil; 2 (6-ounce) boneless, skinless chicken breasts, cooked and thinly sliced; 4 ounces dried Chinese plain or somen noodles, cooked according to package instruction; 1 cup cherry tomatoes, halved; 1 cup green beans, blanched; 2 ounces arugula or other baby lettuce (about 2 1/2 cups loosely packed); 1/4 cup, loosely packed, roughly chopped cilantro; 2 papayas, halved, peeled, and seeded, optional