1/4 cup soy sauce
1/4 cup olive oil
1/2 cup red wine vinegar
2 T Worcestershire Sauce
1/4 tsp. liquid smoke
3 minced garlic cloves
1/4 tsp. black pepper
hot sauce to taste 2 large portabella mushroom caps
2 large hamburger buns
2 slices cheese (Swiss or Muenster)
In a bowl combine all the marinade ingredients together. Place each mushroom in another bowl, gill side up. Pour 1/2 of the marinade over each mushroom, pouring a little in the bottom of the bowl first, to wet the upside down cap, and the remainder into the upturned cap. Marinate for 5-10 minutes. Do not marinate longer as the mushrooms will absorb too much marinade.
Grill mushrooms on a wood or charcoal fire, or in a hot skillet on the stovetop, or under a broiler. 2-3 minutes per side will usually do, or until the mushrooms are browned and tender. If you like, melt a slice of cheese on top during the last minute or so of cooking. Serve on burger buns with toppings of your choice.