Balsamic Grilled Vegetables

Name: Balsamic Grilled Vegetables
Ingredients: 1 1/2 cups balsamic vinegar, preferably aged; 1 tablespoons brown sugar; 2 tablespoons honey; 1/2 cup balsamic vinegar, preferably aged; 1/4 cup extra-virgin olive oil; 1 tablespoon sea salt; 1 tablespoon freshly ground black pepper; 1 teaspoon granulated garlic; 3 (9 to 12-inch) carrots, sliced lengthwise, 1/4-inch thick; 2 celery roots, trimmed and cut in 1/4-inch slices; 3 large red onions, cut into rounds, 3/8-inch thick; 2 (7 to 8-inch) zucchini, sliced lengthwise, 1/4-inch thick; 4 (4-inch), crooked neck squash, sliced lengthwise, 1/4-inch thick; Oil, for brushing grill