Heat the oil in a saucepan and fry the finely chopped spring onions in it. Cut the pepper into small cubes and add. Also cut the smoked pork into cubes, add to the saucepan and stir occasionally. Now cut the sauerkraut very finely crosswise (1-2 cm strips) and sweat with the other ingredients. Pour in the vegetable stock, bring to the boil and, with the lid closed, let the soup simmer for about 20 minutes.
Then remove from the heat, stir in the herbs and crème fraîche and season the soup with salt and pepper.