Boil up plenty of salted water. Clean, wash and roughly dice the soup greens. Wash the veal shank and add to the soup vegetables. Cook over medium heat for about 1 1/2 hours. In the meantime, peel, wash and slice the potatoes.
Remove the soup vegetables from the stock with a skimmer. Add the prepared potato slices and let it cook. Clean, wash and slice the radishes. Pluck the chervil from the stems.
Clean, wash and drain the lamb's lettuce well. Finely dice bacon. In a dry frying pan leave it crispy. Add vinegar and 200 ml of the veal stock. Season with salt, pepper and sugar, keep warm.
Take the meat out of the broth, remove from the bone and dice. Arrange loosely mixed with the prepared ingredients on a large plate. Pour over with warm bacon sauce.