Peel and chop the onion. Heat the fat and fry the onion in it. Deglaze with 1 1/2 litres of water. Cook peas, smoked pork neck and herbs for about 1 hour. In the meantime peel, wash and slice the carrots. Peel, wash and quarter potatoes.
Clean, wash and cut leek into rings. Add vegetables to the soup after about 30 minutes. Lift the smoked pork loin out of the soup and cut the meat into cubes. Cut kielbasa into slices and heat both in the soup. Season to taste with salt and pepper. Serve sprinkled with fresh herbs