Once you master the concept of indirect grilling, you can grill pretty much anything you once baked in the oven. Even baked apples. But why would you bother? Well, smoke has a natural tie to sugar, a fact that is apparent in such classic sugar-cured foods as smoked salmon, turkey, and ham. It also seems to bring out the autumnal sweetness of apples, which here are stuffed with a luscious filling of brown sugar and graham cracker crumbs before hitting the grill.