Peel, wash and chop the potatoes. ##Celery## wash and chop. Peel and chop onion. Cut half of the cress from the bed. Heat oil in a small pot.
Brown onion, celery and potatoes for 1-2 minutes. Add stock and simmer covered for about 20 minutes. As soon as the potatoes are soft, add cress and puree the soup. Season soup with salt, pepper and a little lemon juice.
Add 4 tbsp. condensed milk and half of the ##crabs##. Serve the soup. Add 1 tbsp. condensed milk in streaks to the soup. Garnish soup with remaining crabs and cress.