1. Combine the balsamic vinegar, orange juice, oil and thyme in a very large bowl.
2. Thinly slice the vegetables lengthways and add all but the tomatoes to the bowl. Season and turn in the liquid to moisten. Cover and marinate for at least 1 hr or up to 24 hours in the fridge, turning occasionally.
3. Preheat a ridged grill pan and cook the vegetables in batches until lightly charred and softened.
4. Lightly cook the tomato halves and keep to one side. Place the marinating liquid in a small pan and bubble for 1-2 minutes. Adjust the seasoning then spoon the marinade over the vegetables.
5. To serve, pile the vegetables on to individual plates and garnish with whole fresh basil leaves. Serve immediately with sesame breadsticks.