Cut off the upper green end of the leek (can be frozen well for use as soup greens), cut the leek stick lengthways up to halfway and wash it under running water so that the sand and earth are washed out. Depending on the thickness of the stick, halve or quarter lengthways and cut across into pieces approx. 1 cm wide. Wash the spring onions, cut the white into rings crosswise. Wash and clean the peppers and cut into bite-sized cubes. Clean the mushrooms with a damp kitchen towel, cut the lower end from the stems and divide the mushrooms. Do not cut too small, liquid will leak out when cooked and the pieces will shrink.
Cook everything together for about 20 minutes, stir in the processed cheese and let it melt. Season to taste with salt, pepper and herbs / seasoning mixture. If necessary, add a little more vegetable stock, depending on how liquid you want the soup to be.
The soup is easy to prepare and tastes even better when it is warmed up the next day.
As a party soup, if other dishes are offered, the amount is enough for approx. 10 - 12 servings, as a main course with a little baguette it is sufficient for approx. 5 - 6 people, depending on your appetite.