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