This recipe also works well using Simon Howie Lamb Fillets. You may need to increase the initial cooking time of the casserole to 2.5 hours. To cook in a slow cooker, preheat your cooker for 20mins on high. Prepare and brown the lamb as above, then arrange the slow cooker dish. Make up the tomato, bean and vegetable mixture as above, then spoon over the lamb. Season well, cover with the cooker lid, reduce setting to low and cook for about 4.5 hours until the lamb is tender.