Clean, wash and halve the mushrooms. Peel and finely chop the onion. Clean or peel, wash and finely chop the greens. Slice the mead ends.
Heat the oil in a pot. Fry the sausage slices for about 2 minutes. Add the mushrooms and fry well while turning. Add soup vegetables and onion and fry briefly. Wash the rosemary, chop roughly and add.
Dust everything with flour and sweat briefly. Add 3⁄4 l water and cream. Bring to the boil, stir in broth and simmer for about 5 minutes. Wash and chop parsley. Season soup with salt, pepper and 1 pinch of sugar. Stir in parsley.