When grilling asparagus on a flat top grill, it is important to remember a few key things. First, make sure that the asparagus is dry before placing it on the grill. If it is wet, the asparagus will not grill evenly and could stick to the grill. Second, heat the grill to a medium-high heat before adding the asparagus. This will help to prevent the asparagus from sticking and will also help to ensure that it cooks evenly. Finally, be sure to oil the asparagus lightly before grilling. This will help to keep the asparagus from sticking to the grill and will also add some flavor. When grilling, be sure to turn the asparagus occasionally so that all sides are evenly cooked. Once the asparagus is cooked to your liking, remove it from the grill and enjoy!