2 tablespoons soy sauce
2 tablespoons balsamic vinegar
1 teaspoon garlic powder
1 teaspoon dried oregano
Freshly ground black pepper
4 large portobello mushrooms, stems removed, gills scraped out, thinly sliced
1 teaspoon olive oil
1 red bell pepper, sliced
1 small yellow onion, sliced
4 slices provolone cheese
1 head butter lettuce, leaves separated
Combine the soy sauce, balsamic vinegar, garlic powder and oregano in a small bowl. Season with pepper. Pour the mixture over the prepared mushrooms and toss to combine.
Lay the cheese over the mushroom mixture, cover and cook just until the cheese melts, 1 to 2 minutes. Then give everything a mix. Remove from the heat, spoon into the butter lettuce leaves and serve.