Preheat a grill pan, indoor or outdoor grill to medium high-high heat. Place the vegetables in a large plastic food storage bag. Mix dressing ingredients in a small bowl, stream in the extra-virgin olive oil and beat dressing with a fork. Pour dressing into the food storage bag and seal bag. Coat the vegetables evenly with dressing then grill vegetables a couple of minutes on each side until marked and tender. Arrange on a small platter.