Instructions: Combine olive oil, vinegar, and garlic. Brush onion slices and mushrooms with oil mixture. Season with salt and pepper. Preheat grill to moderate temperature and arrange vegetables on grill rack. Grill vegetables until they are tender, 5 to 10 minutes. (Onion will take longer than mushroom.)

Remove from grill.

Turn mushrooms gill side up and spread 1/4 cup sauce on each mushroom and divide cheese, onion, sundried tomatoes, olives and sliced basil between them.

Return to grill and cook until cheese melts.

Remove from grill; place on a platter and garnish with basil leaves.

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