Michael uses sprigs of rosemary to brush olive oil on sourdough as it toasts on the grill. He rounds off this timeless appetizer with garlic, lemon-dressed arugula and shaved Parmesan! Sign up for #discoveryplus to stream more #SymonDinners:. Get the recipe ▶ Sign Up For Food Network ▶ Sun's out, grills out! Chef Michael Symon takes in the summer season weather condition and fires up his grill to motivate everybody to get cooking outside with his tasty,…