Peel and chop the garlic. Clean, wash and chop the soup greens and celery stalks. Wash and chop the thyme. Heat the fat. Steam prepared ingredients for about 5 minutes while turning.
Season with salt and pepper. Deglaze with 200 ml water. Cover and cook for about 15 minutes. Put half of the vegetables aside. Puree remaining vegetables in stock and tinned tomatoes. Season soup again with salt, pepper and lemon juice, let it cool down completely.
Stir in the set aside vegetables. Serve garnished with lemon and thyme.