Clean or peel, wash and chop the soup greens. Peel and chop the onions. Peel and wash the potatoes and also cut them into cubes.
Heat 2 tablespoons of oil in a large pot. Brown the soup greens, onions and potatoes in it. Season with salt and pepper. Deglaze with wine, broth and cream, bring to the boil, cover and cook for about 20 minutes.
For the croutons, heat the butter in a large pan. Cut the bread into cubes and toast them in it. Remove.
Clean and wash the leek and cut into thin rings. Heat 2 tablespoons of oil in a frying pan and sauté the leek in it. Season with salt and pepper. Remove. Wash parsley, pluck off leaves and chop finely.
Finely mash the soup with a potato masher. Season to taste with salt and pepper. Serve with leek, croutons and chopped parsley.
Boil 2 bunches of soup greens, 2 onions and possibly 2 cloves of garlic with 1 teaspoon of salt, 1 teaspoon of peppercorns, 2 bay leaves, 4 cloves and approx. 1 1⁄2 l of water. Cover and simmer for about 1 1⁄2 hour. Sieve.