Wash the kale thoroughly and blanch in boiling salted water. Drain and chop roughly. Peel onions and cut into slices. Dice bacon. Heat the lard in a pot and fry the onions and bacon.
Add the kale and stew. Deglaze with broth and let braise for about 1 hour. Peel, wash and quarter potatoes lengthwise. Add to the kale about 25 minutes before the end of the cooking time. Put the chicken legs on top and heat them up with the kale.
Season the kale with salt and pepper.