The wonder of cooking is that it can turn a pile of vegetables into something rich, satisfying and delicious. In this case, eggplant stands in for traditional beef in this hearty, vegetarian version of the comfort food classic. The filling is composed of eggplant, pearl onions, and carrots, topped with the traditional mashed potato topping. Even though this is a meat-free version, theres no question that this pie will please all palates. Pair with red wine or a rich, dark beer for the perfect fall dinner.