Preheat the grill to high heat.
Remove bottom stem from portobello. Brush both sides with olive oil and sprinkle the inside of each mushroom with salt and garlic pepper. Place the mushrooms on the grill bottom side up. Grill for 2 to 3 minutes on each side rotating half way through to achieve grill marks.
Remove from grill, placing the mushrooms bottom side up. Fill with your choice of the assorted sauces and top with your choice of cheese.
Return the mushrooms to the top rack or shelf of your barbeque, close lid and reduce heat to medium high and cook for 5 minutes or until the cheese is melted.
Remove and place on a cutting board and cut into triangles like a pizza. Serve immediately.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Sterling Ball, copyright 2004