Potato salad

Boil the potatoes in salt water, drain the water, roll the potatoes with cold water. Peel and slice the cooled potatoes. Cut the ham into straws, cucumbers in slices. Peel the apple, remove the seed box, cut the apple into plates, and then cut the plates into strips. Mix the vegetable oil with vinegar, crushed shallots, yolk, freiche cream, salt and pepper. Mix the salad ingredients and season with sauce. Let the salad brew under the lid for half an hour, sprinkle with crushed parsley greens.