Wash potatoes thoroughly and cook in boiling water for about 20 minutes. Boil the egg hard and peel it in about 10 minutes. Wash and slice the carrot. Cook in 1/8 litre water and the broth for about 5 minutes.
Drain and collect the brew. Finely chop the onion. Heat the oil. Fry the onion cubes in it until transparent. Deglaze with stock and milk. Stir in binding agent and bring to the boil. Season to taste with salt and pepper.
Drain, peel and halve the potatoes. Warm the potatoes and carrots in the sauce. Cut the sliced sausage into strips. Cut egg into slices and add. Garnish with parsley as desired.