Bring the stock to the boil in a medium saucepan. Remove from the heat, add the chicken to the
stock, then cover and allow to cool in the liquid for 10 minutes, by which time the chicken should
Cut the apples into bite-sized pieces. Shred the chicken breasts and place in a large bowl with
the apple, celery, walnuts, mayonnaise, sour cream and tarragon. Season and toss well to combine.
Separate the lettuce leaves and arrange in a serving bowl. Pile the Waldorf salad over the lettuce