Wash potatoes thoroughly and cook in boiling water for about 20 minutes until firm to the bite. Drain, quench, peel and quarter. For the dressing, peel and finely dice the onion. Heat 4 tablespoons of oil in a small pot. Fry the diced onion until transparent, stirring continuously. Deglaze with broth. Add mustard, vinegar and sugar and warm up lukewarm while stirring. Mix potatoes with the dressing. Season with salt and pepper. Leave to stand for about 2 hours.
In the meantime, clean, wash and shake dry the watercress, spring onions and dandelions. Clean, wash, dry grate and slice the radishes. Dab meat dry. Heat 2 tablespoons of oil in a large frying pan. Sauté the meat in it for about 2 minutes on each side. Season with salt and pepper. Wrap the steaks in aluminium foil and let them rest for about 5 minutes
Fold the watercress, dandelion and radish into the potatoes. Season to taste with salt and pepper. Cut the steaks into slices. Arrange salad on plates. Spread steak strips on top
waiting time approx. 1 3/4 hours