Let the veal sausages steep in boiling water for about 10 minutes, but do not boil.
Peel the onions and cut into thin rings. Make a salad dressing from hot water, stocking powder (I always use less and seasoning as stocking powder can be differently concentrated), vinegar, oil and mustard, season with pepper, only add salt if necessary, the sausages are well salted.
Skin the veal sausages, cut into slices and distribute on 4 plates. Sprinkle the onions on top. Drizzle over the salad sauce and serve with cress.