Waldorf salad is a classic American salad that was created at the Waldorf-Astoria Hotel in New York City. It is made with apples, celery, grapes, and walnuts, dressed in a mayonnaise-based dressing. The salad is often served on a bed of lettuce or in a hollowed-out apple. Waldorf salad is a sweet and crunchy salad that is perfect as a side dish or a light lunch. It is a popular choice for picnics and potlucks.