Dice apples, pour into a bowl and pour over lemon juice. Slice celery, chop nuts and add to apples.
Grind the tuna with a fork, put in a bowl. Mix mayonnaise with sour cream, season to taste and add to the salad .
Disassemble the iceberg into leaves, put Waldorf salad with tuna in leaves and decorate with greens. You can also tear the salad by hand and add directly to the tuna, but then the shelf life will be significantly reduced.