CARPINTERIA Calif. Carl’s Jr. is bringing back the Portobello Mushroom Six Dollar Burger and making it a permanent menu item, the company said Wednesday. The Portobello Mushroom Six Dollar Burger appeared previously as a limited-time offer in 2005 and 2007. The burger features a half-pound Angus beef patty topped with Portobello mushrooms sautéed in a garlic-butter sauce, Swiss cheese, red onion, lettuce, tomato and mayonnaise on a seeded bun.The return of the Portobello burger ...

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