Portobello Burgers

Name: Portobello Burgers
Ingredients: 4 portobello mushrooms, stems on; 2 teaspoons grill seasoning; 2 tablespoons canola oil; 1 tablespoon chopped garlic; 2 teaspoons Worcestershire sauce; 2 tablespoons red wine vinegar; 1/2 cup grated Cheddar; 1/4 cup mayonnaise; 4 hamburger buns, toasted; 4 leaves romaine lettuce; 1 tomato, sliced