Clamped in the middle of two dense charcoal brioche buns embossed with Batman's logo, the wagyu beef patty oozes its succulent juices all over the grilled portobello mushrooms and red onions contained within. The wagyu beef patty had the same weird spongy texture as the chicken patty mentioned above. While the beef patty is sweet and juicy with the glorious fattiness of wagyu quality, the fish-cake like consistency is rather off-putting, and indicates that it may not be 100% ground beef. Accompanying sides consist of a refreshing mesclun salad, fries, and nacho cheese sauce.