The Ultimate Winter Couscous

This is a very hearty vegetable tagine. I cooked the vegetables for the full 45 minutes and they still didn't seem fully done, so I covered the baking dish and let them cook an additional ten minutes. The preserved lemon and harissa add a good deal of flavor to the dish, so don't skimp on them. This dish is perfect for a cool fall or winter dinner.

Cross-posting from British edition: http://www.cookbooker.com/recipe/35862/winter-couscous