Waldorf salad is a classic for a reason. The sweet mix of red grapes, chopped apples, crunchy celery, and buttery walnuts dressed in a tangy, creamy dressing can be served any time of year, whether as an appetizer, a side salad, or a light lunch. Try this retro salad piled high onto leafy green lettuce, then make it your own by adding flaked tuna or shredded cooked chicken.