Drain the bacon crisply in a pan without fat, take it out and let it drain on kitchen paper.
Clean the salad, wash, shake dry and pluck into pieces. Wash and clean the cucumbers and peel thin slices with a peeler. Peel onion and cut into fine rings. Drain peppers in a sieve and cut into pieces. Cut cheese into thin slices.
Mix yoghurt, vinegar and mustard. Season with salt, pepper and 1 pinch of sugar. Put some dressing in four glasses. Break the bacon into pieces. Pile lettuce, cucumber slices, paprika, bacon and cheese on top. Garnish with onion rings. Serve the rest of the dressing.