Wash the potatoes and cook in boiling salted water for 20 minutes. Quench cold, peel and let it rest for a while. In the meantime clean and wash the beans and cut them into bite-sized pieces. Cook in boiling broth for 15 minutes.
Season with pepper. Cut the potatoes into slices. Pour beans and hot broth over them. Cover and leave to stand for 30 minutes. Peel onions, cut one into rings, dice the rest finely. Dice bacon as well.
Leave to cool in hot oil until crisp. Add diced onion and deglaze with sour cream. Season with salt and pepper. Arrange potato salad with cream sauce and matie with onion rings on a plate.
Wash the chives, cut them into small rolls and sprinkle over them. Serve garnished with lemon and parsley.