Take the lamb out of the marinade and shake off some of the oil. Cut into large pieces of approximately the same thickness
Picture and put into an ovenproof dish skinside up. Put the vegetables and lamb into the oven and cook for about 15 minutes and then turn the meat and stir the vegetables. Cook for a further ten minutes or so and check the meat is done to your taste with a carving fork and whether the vegetables are tender. Cook either some more if necessary.