Grilled Portobello Mushroom Burgers
4 portobello mushroom caps, cleaned
2 tbsp Worcestershire sauce
1 tbsp soy sauce
1 tbsp olive oil
2 tbsp rosemary, chopped
2 tsp Montreal steak seasoning
1/2 red onion, sliced into rounds
4 oz Swiss cheese, sliced thin
1 tomato, sliced
1/2 avocado, sliced thin
1/2 cup baby spinach leaves
4 whole wheat hamburger buns
Non-stick cooking spray
In a large bowl, whisk together the Worcestershire, soy sauce, olive oil, rosemary, and Montreal steak seasoning. Place the portobello caps in the bowl and toss, using a spoon to coat with the marinade.
Let stand at room temperature for 30 minutes, turning over every 5 minutes.
Preheat a grill (or grill pan) to medium. When hot, coat with the non-stick spray and grill the portobellos—cap-side down. Grill for 4-5 minutes per side, frequently brushing with marinade.
Top the mushrooms with the Swiss and cook for another 1-2 minutes. At the same time, place the onion slices on the grill and cook for 1 minute per side. Then place the buns on the grill and cook until toasted.
To finish, arrange the spinach and grilled portobellos on the buns, then top with the grilled onions, sliced tomato, and avocado. Serve immediately.
Approximate Nutritional Values: http://www.food.com/recipe/portobello-mushroom-burgers-403717