1. Heat a gas or charcoal grill to medium-high heat. Slice off the stem end of the strawberries to create a flat top.
2. On prepared skewers, carefully spear pineapple, watermelon and strawberries, and set in a tray for grilling.
3. Place the skewers on the barbecue and grill for 5 minutes, or until grill marks form. Once grill marks form, turn the skewers. Remove when they are seared on all sides. Serve immediately.
Per serving: 140 calories, 1g fat, 0g saturated fat, 0mg cholesterol, 3mg sodium, 36g carbohydrate, 5g fiber, 26g sugar, 2g protein