Waldorf Salad is a classic American salad that is popular in Porto. It is made with crisp apples, celery, grapes, and walnuts, all tossed in a creamy dressing made from mayonnaise and lemon juice. The salad is often served on a bed of lettuce or spinach. Waldorf Salad is a great choice for those looking for a sweet and savory salad option in Porto.