Place meat roasting rack in shallow baking dish or roasting tin. Place chops on rack. Season with salt and pepper to taste. Cover chops with onion slices. Pour water in bottom of pan, making sure it is not high enough to touch the chops. Cover with aluminium foil or tight lid and roast for one hour.
Cut into one chop to check for doneness. When chops are done all the way through, remove foil or lid and return to oven for 15 to 20 minutes to brown slightly. Watch carefully during browning.