In bowl combine olive oil, balsamic, salt and pepper. As different vegetables need different cooking times, fill skewers with only one kind of vegetable, for example one skewer of just tomatoes, one of just mushrooms etc. Asparagus, zucchini and onion need not be skewered. Place prepared skewers and vegetables in baking dish. Brush all vegetables liberally with balsamic oil mixture. Pour remaining balsamic mixture over vegetables. Let sit 10-20 minutes. Grill vegetables for 3-5 minutes each side on hot BBQ or grill. Take care not to overcook vegetables. Remove vegetables from marinade. Save marinade for after grilling. Arrange vegetables on plate and drizzle with 1 oz. of remaining marinade. Sprinkle with parsley and serve. These are also great just at room temperature, if you want to do ahead.
Ready in 50 min