Get the recipe @ http://allrecipes.com/recipe/portobello-mushroom-burgers/detail.aspx
Watch how to make grilled Portobello mushroom burgers. Mushroom caps are marinated in a balsamic vinegar and garlic marinade, and grilled, which gives them a wonderful meaty flavor and texture. Both vegetarians and meat eaters love these mushroom burgers. Add a slice of provolone cheese and top your burger with all the fixings!