Grilled Portabella "Burger"

Yield: 1 Servings
1Bun-size Portabella mushroom
Vegetarian Worcestershire, Tamari, or other basting liquid
1Thin slice FF or reduced-fat cheese of choice
BBQ, Teriyaki, Taco Sauce, or condiments of your choice (I love Westbrae Fat-free BBQ)
1Leaf of lettuce, optional
1Thin slice tomato, optional
1Wholegrain bun, split and toasted