Serving suggestion: Baby greens, extra grapes, raisins and walnuts for garnish
Coat the chopped apple with the lemon juice in a large bowl. Add the chicken, grapes, celery, raisins and walnuts, and gently combine.
In a small bowl, combine the yogurt, mayonnaise, orange juice and salt. Gently fold the dressing into the salad. Serve on a bed of greens.