COUNTERPATH CORP - The Counter Custom Burgers Announces New Mushroom-Blend Burger. The Mushroom-Blend Burger and Sweet Sriracha Brussels Sprouts will be available for a limited time only. The Mushroom-Blend Burger features all-natural beef blended with mushrooms, melted Swiss, umami sauce, fresh lettuce, crisp red onions, topped with sauteed mushrooms and served on a toasted wheat bun. The Sweet Sriracha Brussels Sprouts feature fried Brussels Sprouts tossed in a sweet Sriracha sauce and sea salt.