Marinate in Olive oil, vinegar and Italian spices, & garlic for at least 30 minutes. I have also used an Italian type dressing.
Grill on the Bar-B-Que until tender but not mushy. It is a real hit and super easy to do. Other veggies this works with are, peppers, Bok Choy, onions, mushrooms, carrots. Etc. be creative.