Peel and wash the potatoes and cook them in boiling salted water for about 20 minutes. Wash the meat and dab dry. Season with salt and pepper. Whisk eggs in a flat plate. Put flour and breadcrumbs on a flat plate. Season meat with salt and pepper. Turn meat first in flour, then in egg and finally in breadcrumbs.
Heat 4 tablespoons of oil in a frying pan and fry the escalopes in portions for about 4 minutes, turning them over. Peel onions and cut into fine rings. Heat 1 tbsp. oil in another pan, fry the onions for approx. 2 minutes, dust with sugar and allow to caramelise. Deglaze with balsamic vinegar.
Drain the potatoes and let them evaporate briefly. Add milk and butter, season with salt and nutmeg and mash to a puree. Wash the salad and shake dry. Arrange schnitzel, mashed potatoes and onions, add salad. Drizzle with olive oil and vinegar.