Shawn and Bruno served this at a workout crew BBQ and I thought it was brilliant! It's a fantastic "make ahead" dish that is really good and served at room temperature. As can be well imagined, this is a wonderful accompaniment to almost any grilled fish or meat.
The only real trick is to grill the veggies in batches as they will all cook at varying rates.
Any combination of summer vegetable is great - some ideas...
Mix all ingredients together.