Here is what I love about this recipe. In combination, the grilled polenta, balsamic mushrooms and arugula make a delightful meal. Individually, the methods for preparing the polenta and mushrooms can be used over and over again in a variety of ways. For instance, the balsamic mushrooms are nice sliced over grilled steak. Serve the grilled polenta on its own as a side dish for any grilled vegetables or meats. Make the polenta ahead of time so it has time to chill before grilling. Enjoy!