4 large portobello mushroom caps
1/4 c balsamic vinegar
2 TBS olive oil
1 tsp basil
1 tsp oregano
1 TBS minced garlic
salt and pepper to taste
4 oz. thinly sliced Provolone cheese
1. Cut stems off mushrooms, and place smooth side up in shallow dish.
2. In a small bowl, whisk together vinegar, oil, basil, oregano, garlic, and salt and pepper. Pour over mushrooms. Let stand at room temperature for around 15 minutes or so, turning twice.
3. Preheat grill for medium high heat.
4. Brush grate with oil. Place mushrooms on the grill over medium high heat, reserving marinade for basting. Grill for 5 to 8 minutes on each side, or until tender. Brush with marinade frequently. Top with cheese, if desired, during the last 2 minutes of grilling.