Remove the canned fish from the brine, remove bones and skin.
Chop celery stalks.
Toast the bread in a toaster.
In a small bowl, combine the curd and the pickled cucumber relish sauce.
In another bowl, combine salmon and celery.
For each sandwich, place lettuce (optional) and half of the curd mass on one slice of bread. Cover with another piece of bread. Put half of the salmon mass. Cover with third piece of bread.
Cut the triple club sandwich with salmon, cottage cheese and celery in half (diametergonally or into two rectangles) and serve immediately.