I never used to know what to do with fennel, but these days, I can't get enough of it. Fennel is the most wonderfully versatile vegetable. You can slice raw fennel thin and serve it with a little shaved Parmesan for a crisp salad. Or you can plop it in the oven with a little balsamic and roast it until it gets sweetly caramelized. Fennel has a special affinity for Parmesan, and in this simple gratin fennel wedges are tossed with breadcrumbs, Mozzarella and Parm, and baked until golden brown. A lovely side for lighter fare, such chicken or fish, and would also work well as a dressy side for a holiday meal.