Bring rice in chicken broth to a boil, reduce heat, cover pan tightly and simmer 15 minutes without peeking. Remove pan from heat and let stand, still covered, 5 minutes. Cool to room temperature or chill. When ready to transport or serve the salad, combine in a medium bowl the cooked rice with turkey strips, apple, celery and walnuts (toast nuts in a small, ungreased skillet over medium heat until nuts are fragrant). Using a fork, toss with salad dressing and scoop salad into lettuce cups.