Halve or quarter the dumplings and cut into 1 cm thick slices. Cut the roast and cheese into strips, cut the tomato and cucumber into slices, cut the onion into thin rings and put everything in a bowl.
Mix vinegar, paprika, mustard, oil, salt, pepper and chilli salt to a spicy marinade and mix in the parsley. Pour over the salad and mix gently. Let it steep for about an hour, then season again to taste.