Quarter the mushrooms and cut the onion into cubes. Cut the leek, carrots and sausages into slices.
Melt the butter in a large saucepan and fry the sausage slices on both sides. Then add the mushrooms and fry while stirring vigorously (so that they do not turn brown). If you want to keep the sausages crisp, you can take them out and sprinkle them again at the end.
Now fry the carrots and leek briefly and sprinkle with chopped rosemary. Sprinkle everything with flour and sauté briefly. Then pour the broth and Cremefine or cream over it and cook for at least 5 - 10 minutes.
Stir in the parsley, season the stew with salt and pepper and serve.