Clean, wash and chop the Chinese cabbage and spring onions. Peel Lyon sausage, cut in half lengthwise and cut into slices. Clean, wash and cut radishes into sticks. For the sauce, melt the fat and sauté the flour in it. Deglaze with stock and cream.
Bring to the boil while stirring constantly. Season to taste with salt, pepper and mustard. Heat 1 tablespoon of oil in a large pan. Brown the sausage slices in it, take them out and put them aside. Heat another tablespoon of oil in the frying fat. Fry the Chinese cabbage and spring onions. Season with salt and pepper. Add the sausage again. Deglaze with the prepared sauce, bring to the boil and season if necessary.
Heat another tablespoon of oil in the frying fat. Fry the Chinese cabbage and spring onions. Season with salt and pepper. Add the sausage again. Deglaze with the prepared sauce, bring to the boil and season if necessary. Serve generously sprinkled with radishes