It's posted a recipe from Slow Cooking from Around the Mediterranean, have a look here
http://mediterraneancuisine.suite101.com/article.cfm/tunisian_sweet_potato_casserole
This is just one of the great recipes is this slow cooking series, great books for seasoned slow cooker users or inexperienced but keen like me!
This recipe is reproduced with kind permission from Carolyn Humphries and Foulsham books.