Grilled Portobellos and Summer Vegetables

Name: Grilled Portobellos and Summer Vegetables
Ingredients: 1 whole medium yellow squash, sliced in half lengthwise; 1 whole medium zucchini, sliced in 1/2 lengthwise; 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 half lengthwise; 3 green onions; 1 red bell pepper, seeds removed and quartered into large flat pieces; 1 gold or yellow bell pepper, seeds removed and quartered into large flat pieces; 2 portobello mushroom caps; Kosher salt; Freshly ground black pepper; 1/2 cup extra-virgin olive oil; 4 cloves garlic, minced