Peas in shell. Peel, wash and chop the potatoes. Peel and chop the onions. Heat the oil in a pot and brown the onions lightly. Pour in broth, add potatoes and peas and bring to the boil.
In the meantime clean or peel and wash the soup greens. Dice celery and carrots, cut leek into rings. Add the soup vegetables to the stock. Season with some pepper and simmer covered at low heat for about 25 minutes.
Cut the sausages into slices. Clean and wash the mangetouts. If necessary, puree the pea soup slightly, add the sugar snap peas and sausages and continue cooking for about 5 minutes. Season soup with salt and pepper and garnish with parsley.