Arrange the dumplings over the stew, submerging them so that just the tops are visible. Place a clean tea towel over the slow cooker before putting the lid on – this helps the dumplings to puff up.
Roll the pieces into balls. Remove the lid from the slow-cooker and skim off any fat that has risen to the surface. Arrange the dumplings on top of the casserole and cover. Cook for 30 minutes ...