CNN  —  The McRib is returning to menus this holiday season – but don’t get used to it. McDonald’s announced Wednesday that its famed boneless pork patty sandwich will be available again starting December 3. But, as always, it will only be for a limited time. And the same goes for another fan-favorite fast food item, Taco Bell’s Nacho Fries, which similarly hasn’t secured a permanent spot on the menu despite its popularity. Instead, limited offerings like the McRib or the Nacho Fries disappear