Leave the bacon in the hot pot. Add soup greens and spring onions and sauté with. Top up with the vegetable stock, add potatoes and bring to a boil. Simmer on a low heat for 30 minutes.
Finely puree the soup with the hand blender. Add the carrots, sausages and sour cream and simmer for another 20 minutes. Season with marjoram, salt and pepper, add parsley and serve.