Peel and chop the onion and garlic. Clean, wash and chop the leek into small pieces, except for a longer piece. Peel, wash and chop the potatoes
Fry the onion and garlic in hot fat while stirring. Add leek and potatoes (up to 2 tablespoons) and steam briefly. Add 1/2 l water and milk. Add stock, bring to the boil. Simmer covered for about 15 minutes
Dice the remaining potato cubes a little finer if necessary. Fry in hot oil for about 8 minutes until golden brown. Cut the rest of the leek into strips and fry briefly. Season both and take out
Finely puree the soup and season to taste. Whip the cream until semi-stiff and stir in all but 2 tablespoons. Serve the soup. Garnish with the rest of the cream, potato croutons and leek