Slice the potatoes into bitesize pieces and boil until tender, but not soft. Peel the apple and slice into bitesize pieces (sprinkle with lemon juice until ready to use). Chop the celery finely. Cool the potatoes by draining and placing in pan of ice water. Combine all ingredients and mix with dressing and dill if desired. I used Medford Farms (tm) Creamy Dill No-Oil Dressing. Chill several hours. Quick and delicious. From the recipe file of Val Rowe MM 6/12/93