In a large bowl, stir together olive oil and fresh herbs. Add mushrooms, onions, sweet peppers, and zucchini. Toss gently to evenly coat vegetables.
If you like, place the vegetables on a vegetable grilling tray and put the tray directly on the grill rack of an uncovered grill. Or you can place the assorted vegetables directly on the grill rack to cook.
Grill directly over medium* coals for 6 to 10 minutes or until tender, turning occasionally. Season with salt and pepper. Garnish with fresh herbs, if you like. Makes 4 side-dish servings.
To test the temperature of the preheated coals, place your hand above the coals at the height the food will be cooked. Start counting and if you need to remove your hand after 4 seconds, the coals are medium.