Hmmm. I will have to try this to decide if grilled is the way to eat Watermelon, for real! Cut wedges at least 1/2 inch thick and brush w/ an Olive oil mixture. You can add minced onion or garlic, some S&P, herbs. Then Grill about 2 minutes on each side. Top with Fudge, Ice Cream or Fruit. Here is a recipe from Food Network.
Grilled Romaine Lettuce
Cut a Romaine head in quarters so that root is still intact to hold leaves. Grill open side down. Top with a Balsamic or olive oil dressing or bacon bits, Blue Cheese. Here is another Food Channel Recipe:
Cut a Banana length-ways, but leave in its peel. Grill 2 minutes face down. Fill peel pocket w/ Chocolate pieces, Nutella, Marshmallows, Brown Sugar & Cinnamon, etc.... and grill another 5 minutes on the peel side. Recipe...http://www.foodnetwork.com/recipes/bbq-with-bobby-flay/grilled-bananas-with-walnut-caramel-cloud-nine-brownies-recipe/index.html