Veg Out: Philly Portobello Steak Sandwich

Ingredients

• 1/4 cup olive oil
• 2 tablespoons soy sauce
• 2 teaspoons ground fennel seeds
• 1 tablespoon minced or pressed garlic
• 1/4 teaspoon crushed red pepper flakes
• 2 teaspoons dried oregano
• 1/4 teaspoon paprika
• 1/4 teaspoon freshly ground black pepper
• 1/2 teaspoon salt
• 4 medium portobello mushrooms (about 5 inches in diameter)
• 2 tablespoons olive oil
• 4 cups thinly sliced onions
• salt
• 1 large red or green bell pepper
• 2 tablespoons all-purpose flour
• 4 ounces grated sharp cheddar, mozzarella or provolone cheese
• 4 Italian rolls or Italian bread
• 2 tablespoons butter
• mustard
• Hot cherry peppers (optional)