Cut the peeled turnip (s) into approx. 2x2cm and the carrots into approx. 1x1cm cubes. Clean the Brussels sprouts and cut the stalk crosswise.
Heat the clarified butter in a large saucepan, leave out the bacon and fry the diced onion until golden brown. Now gradually add all the vegetables with the chestnuts and 2/3 of the parsley and stir-fry for about 15 minutes. Pour in the hot broth, season with marjoram, pepper and salt, bring to the boil and cook for 10 minutes. Then remove about 2/3 of the contents with a slotted spoon and set aside. Now let the rest of the boil for about 10 minutes, until everything is done, then puree. If necessary, add a little more stock. Then add the removed vegetables with the sausage slices again. Let everything simmer for another 5-10 minutes, until the remaining vegetables are cooked through. It should still have some bite, however. Season to taste with pepper and salt.
Sprinkle with the remaining parsley before serving.