Boil the potatoes, let them cool, and cut into cubes.
Slice the cucumber thinly, sprinkle with salt, and drain the moisture.
Finely chop the onion.
Add potatoes, cucumber, onion, and chicken breast ham to a bowl.
Make a dressing with yogurt, mustard, salt, and pepper, then mix with all the ingredients.
Transfer to a plate and sprinkle with sesame seeds to finish.