Baked Polenta with Bacon and Gruyere

Let's get the basics out of the way before we dive, face first, into this pan of deliciousness. Is it cornmeal or polenta? What's the difference? What should I buy? Why does one bag say cornmeal and the other bag say polenta? So, polenta is the name of the dish and cornmeal is the stuff it's made out of. Easy, right? You can use regular, medium or course ground cornmeal to make polenta but