Add the hot mash, black pudding and parsley together and set aside. Saute the cabbages and leeks then set aside also. Sear the steaks in a hot pan, season and add a little butter and place in a hot oven 220ºC for 2 minutes. Remove from the oven and rest for 5 minutes before slicing. Correct the seasoning and serve with the wilted greens and black pudding mash.