How to Make It
Trim 1/2 inch from both ends of watermelon. Stand up watermelon on 1 cut end; cut lengthwise into quarters. Cut each quarter into 1-inch slices. Sprinkle slices evenly on both sides with sugar and salt.
Preheat a gas grill to high (450ºF to 500°F). Place watermelon slices on oiled grates; grill, uncovered, until grill marks appear, about 3 minutes per side. Serve with desired toppings.