Preheat grill to medium heat. Brush tomato and next 5 ingredients (through onion) with oil. Place fruits and vegetables on grill rack; grill, rotating halfway through grilling to achieve even grill marks, about 3 to 5 minutes. Set limes aside.
Peel and finely dice remaining grilled fruits and vegetables. In a bowl, combine fruits and vegetables, cilantro, and chile; toss together. Squeeze in lime juice; sprinkle with salt to taste. Serve with butter lettuce leaves.