Portabella Mushroom Burgers

4 portabella mushrooms
2 Tablespoons low-fat Italian dressing

Wash mushrooms quickly under cold running water. Dry immediately to prevent sogginess. Divide dressing between mushrooms and brush to cover all surfaces. Preheat grill and place a sheet of aluminum foil on grill surface. Place prepared mushrooms on foil and cook on medium-hot grill with rounded side down. Grill about five to eight minutes. Turn carefully to cook other side until mushroom is easily pierced with a fork. Serve on warm buns with all your favorite burger toppings. Yields four.