Business Wire -- Carl's Jr.(R) brings fancy back to fast food with the Portobello Mushroom Six Dollar Burger(TM), returning to the menu today. The award-winning burger, a customer favorite which set the standard for fine-dining taste at a quick-serve price when introduced in 2005 and again in 2007, now will become a permanent menu item at Carl’s Jr. Topped with sautéed Portobello mushrooms, Carl’s Jr. makes it easy for burger fans to get their fine-dining fix.
