Step 1

Remove the stem from the mushrooms and peel the top layer of skin off the top (see above for more details). Remove the gills with a spoon and wash the mushrooms well. Pat dry.

Step 2

Combine the worcestershire sauce, balsamic vinegar, and garlic powder in a shallow dish. Add the mushroom and rub the marinade in. Let marinate, turning the mushrooms once or twice, for 30 minutes.

Step 3

Heat your grill over medium heat. Cook the mushrooms over a low flame, gill side down for 5 minutes. Flip and cook for another 5 minutes. Melt the cheese on the mushrooms gill side up. Remove from heat.

Step 4

Spread your favorite burger condiments like mayo and ketchup on a bun and place the portobello burger on the bottom bun. Top with your favorite burger toppings like lettuce, tomato, onion, and pickle.