In a large bowl, whisk together Duke’s mayonnaise, sour cream, lemon juice, and sugar. Stir in chopped apples, grapes, celery, and dried cranberries.
Cover and refrigerate for a minimum of 2 hours.
Remove from the refrigerator, stir in walnuts, and serve immediately.
Notes
Taste the dressing before adding it to the salad. Adjust the amount of lemon juice and sugar to achieve the perfect balance of tanginess and sweetness.
Allowing the salad to chill in the refrigerator for a couple of hours allows the flavors to meld together.
Serve the Waldorf salad in a chilled bowl or on a bed of lettuce leaves for an elegant presentation.