Can this be cooked in a slow cooker?

Yes, it could. Here's an article about adapting recipes for a slow cooker: http://food52.com/blog/8662-how-to-adapt-a-recipe-to-a-slow-cooker Also, in the comments of the recipe, one person recommended going through steps 1 and 2 of the recipe as written, and then putting everything in the slow cooker.