A Waldorf salad is a salad generally made of fresh apples, celery and walnuts, dressed in mayonnaise, and usually served on a bed of lettuce as an appetizer or a light meal. The salad was first created between 1893 and 1896 at the Waldorf Hotel in New York City. Oscar Tschirky, who was the Waldorf's maître d'hôtel and developed or inspired many of its signature dishes, is widely credited with creating the recipe. In 1896, Waldorf Salad appeared in The Cook Book by "Oscar of the Waldorf"; the original recipe did not contain nuts, but they had been added by the time the recipe appeared in The Rector Cook Book in 1928. Other ingredients, such as chicken, turkey, grapes, and dried fruit are sometimes added. Updated versions of the salad sometimes change the dressing to a seasoned mayonnaise or a yogurt dressing. A variation known as an Emerald Salad replaces celery with cauliflower. The salad also may include zest of oranges and lemons. The salad is mentioned in the 1934 Cole Porter song "You're the Top", and was also popularized by its central role in the plot of the "Waldorf Salad" episode of the 1970s British sitcom Fawlty Towers.