Balsamic Grilled Vegetables

Name: Balsamic Grilled Vegetables
Ingredients: 1 medium yellow squash, sliced on bias; 1 medium zucchini, sliced on bias; 1 medium eggplant, sliced into 1/2-inch thick circles; 1 red onion, sliced in 1/2-inch thick circles; 2 Roma tomatoes, sliced in 1/2 lengthwise; 1 red bell pepper, stemmed, seeded, and quartered; 1 yellow bell pepper, stemmed, seeded, and quartered; 2 portobello mushroom caps, gilled and peeled; 3 green onions; Kosher salt; Freshly ground black pepper; 1/2 cup extra-virgin olive oil; 1/2 cup balsamic vinegar