The Waldorf Astoria is closing but you can make its famous salad with this classic recipe.
Later versions of the salad commonly added chopped walnuts. If you'd like, toss 1/4 cup of them in with the celery and apple.
Peel apple and cut into halves. Remove core and slice halves into 1/4-inch thick pieces. Reserve 4 slices. Cut remaining slices into thin strips.
In a medium bowl, mix celery, mayonnaise and apple strips; season with salt and pepper to taste. Plate the mixture over lettuce and top with reserved apple slices.