01 -
Clean the grill grates and preheat to medium heat, 350°F to 450°F.
02 -
Trim the ends of the eggplant, zucchini, yellow squash, and onion, and slice into ⅓" to ½" pieces. Seed the red bell pepper and cut into quarters. Trim the ends of the asparagus.
03 -
Drizzle the vegetables with olive oil and sprinkle evenly with salt and pepper.
04 -
Grill the vegetables with the lid closed until tender and lightly charred, about 8 to 10 minutes for the bell peppers, onion, and mushrooms; and 5 to 7 minutes for the yellow squash, zucchini, eggplant, and asparagus.
05 -
Serve the grilled vegetables warm or at room temperature.