What are the ingredients to the Waldorf salad?

= Waldorf Salad I = * 3 tart Apples - peeled, cored and chopped * 1 tablespoon lemon juice * 1 cup seedless grapes * 2 stalks celery, chopped * 2 green onions, chopped * 2 tablespoons mayonnaise * 2 tablespoons plain yogurt * 3 tablespoons Apple juice * 1/4 teaspoon celery seed * 1 bunch watercress, trimmed and chopped * 2 tablespoons chopped walnuts

# In a large bowl, combine the Apples and lemon juice. Add the grapes, celery, and green onions; toss. # In a small bowl, whisk together the mayonnaise, yogurt, Apple juice and celery seeds. Spoon over the Apple mixture, and toss gently. # Wash the watercress, and dry thoroughly. Arrange greens on individual salad plates. Mound the Apple mixture on top, and sprinkle with the walnuts.