For the potato-mustard-mayonnaise salad, boil the potatoes, peel and cut into flakes. Peel the onion, chop finely and add to the potatoes.
Prepare a salad with mayonnaise, mustard, salt, pepper, vinegar, sugar and water.
Arrange in salad bowls and sprinkle the potato-mustard-mayonnaise salad with chives and pepper if desired.
Preparation Tip:
The potato-mustard-mayonnaise salad goes very well with fish.