Waldorf Salad is a classic American salad that was first created at the Waldorf Astoria Hotel in New York City. It consists of crisp apples, celery, grapes, and walnuts, dressed with mayonnaise or a yogurt-based dressing. The combination of sweet and savory flavors in a Waldorf Salad is delightful. In Madrid, you can find this salad in American-inspired restaurants or places that offer international cuisine. It's a refreshing and unique salad option.