Step 1In a large bowl, whisk together the lemon juice, mayonnaise, sour cream and salt. Taste and add additional lemon juice if desired.
Step 2Stir in the chicken, diced apple, olives and celery, and toss to combine. Season to taste with additional salt. Chill for one hour before serving.
Step 3Core and cut the remaining apple into 1/4 -inch slices. Serve scoops of salad garnished with apple slices.