Bring bacon to the boil in 1 litre of water. Season with pepper and laurel. Add lentils and cook for about 30 minutes. Skim off the resulting foam. In the meantime peel and wash the potatoes, carrots and celery and cut them into small pieces. Clean, wash and cut leek into rings.
Add prepared vegetables to the lentils, cover and cook for another 30 minutes. Add mead ends during the last 15 minutes. Remove the bacon, cut into cubes and add again. Season lentil pot with salt, pepper and vinegar. Serve sprinkled with parsley