Prepare the grill and heat it for medium high heat cooking.
Whisk together all the ingredients for the marinade and pour them all over the veggies. Mix well. Let this sit for 10 minutes and then skewer the veggies.
Place the skewers on the grill. Cook till the vegetables are lightly charred (approx 2-2.5 minutes) and then flip them to cook the vegetables on the other side. Brush once with leftover marinade in the bowl while they cook. Once they are charred all over and tender, remove them off the grill and serve.