In a small bowl, whisk together yogurt, honey, lemon juice and ginger. In a large bowl, combine cubed chicken or turkey, diced apple, sliced grapes, celery, raisins or dried cherries, walnuts, salt and pepper. Pour dressing over mixture and gently toss to combine. Refrigerate for one hour. When ready to serve, gently toss salad greens with olive oil. Prepare 4 plates. Place 1 cup of lettuce greens on each plate. Distribute chilled salad mixture evenly over top of lettuce on all 4 plates.