This is a great meatless burger option. Portobello mushrooms have a great meaty texure and are the perfect size for grilling and serving on a hamburger bun, pita bread or even on top of a salad. Once in a while you can trade a traditional meat patty for the lean protein, fiber, vitamins, minerals and antioxidants of a big old mushroom. Dress it up like burger with all the fixings and you may forget what you are missing! Worcestershire sauce contains anchovies (fish). For a vegan/vegetarian version, or to avoid fish as an food allergy substitute a vegan Worcestershire version, like the one made by Annie's.