Wash the potatoes well. Depending on the size, halve lengthwise if necessary. Cook in water for about 15 minutes. Pour off, pour broth over it. Let it cool down.
Clean, wash and chop the cucumber and radishes. Peel and finely chop the onion. Wash chives and cut into small rolls. Mix sour cream, salad cream and oil. Add onion and chives. Season. Add salad dressing to the potatoes. Mix in cucumber and radishes. Let it simmer again for about 30 minutes.
Season. Add salad dressing to the potatoes. Mix in cucumber and radishes. Let it simmer again for about 30 minutes. Cut the herring into small pieces. Arrange salad with herring and some frsée salad