Grilled Portobello and poblano tacos are a vegetarian summer meal that will even please meat eaters. Slices of mushroom are sauteed with onions and spicy poblano peppers. The mixture is seasoned with lime juice and chipotle chile powder. If you are a garlic lover, feel free to add a minced clove or two. Each taco is topped with fresh pico de gallo salsa, cilantro and guacamole.