A twist on the classic Waldorf salad, inspired by the flavors of Napa Valley. This salad features crisp apples, crunchy celery, sweet grapes, and toasted walnuts, all tossed in a creamy yogurt dressing. The addition of Napa Valley's famous golden raisins adds a touch of sweetness. This refreshing salad is perfect for a light lunch or as a side dish for a summer barbecue.