For the salad, wash the potatoes and cook them covered in water for about 20 minutes. Drain, quench briefly and let cool. Peel potatoes and let them cool down.
Cut bacon crosswise into strips. Clean and wash spring onions and cut into rings. Heat 1 tablespoon of oil in a frying pan. Fry the bacon until crispy. Fry the spring onions briefly. Deglaze with vinegar and 1/4 l water, bring to the boil and simmer for 2 minutes.
Stir in stock and 2 tablespoons of oil. Season with salt, pepper and 1 pinch of sugar. Cut the potatoes into slices in a bowl. Pour hot marinade over them, mix and leave to stand for about 1 hour.
For the breadcrumbs, heat 1 tsp. oil. Roast the mustard seeds in it for 1-2 minutes, remove. Mix with fried onions and breadcrumbs. Prepare cutlets, bread them and fry them (see page 62/63). Season salad to taste.
Dress everything.