1 Rinse the celery, dethreading if necessary. Cut the celery into small cubes and set aside in a bowl.
2 Rinse lemon in hot water, wipe dry and finely grate peel over the celery. Mix 3 tablespoons of lemon juice with the celery.
3 Rinse the apples, wipe dry, quarter and core. Cut the apples into small cubes or slices and add the apples to the celery.
4 Roughly chop the walnuts. Whip the milk until smooth and then season with pepper.
5 Mix mayonnaise with the celery and apple mixture and nuts.
6 Chop the celery leaves finely and mix into the salad. Cover the salad and let chill in the refrigerator for at least an hour.
7 When ready to serve, cut the pineapple into small pieces and mix into the salad. Season to taste with lemon juice and pepper.