Clean the mushrooms, possibly wash and halve them. Cut the sausage into slices. Fry both in hot oil in a large pot.
In the meantime peel and chop the onion. Clean or peel, wash and chop the greens. Season sausage and mushrooms with salt and pepper, remove.
Sauté the vegetables and onion in the frying fat. Wash and add rosemary. Dust with flour and sweat everything. Add 800 ml water and cream while stirring, bring to the boil. Stir in stock and simmer for about 5 minutes. Add sausage and mushrooms again and heat up. Season soup to taste. Wash, chop and sprinkle parsley over it.