Introduced in 1982, the boneless barbecue pork sandwich has been one of the rare limited-time offerings in the fast-food industry that returns annually to great fanfare. Despite its popularity, McDonald's has refrained from making it a permanent menu item.
Earlier this week, the fast-food giant took diners behind the scenes to show what really goes into McRib production.
Read MoreMcDonald's: Here's what the McRib is really made of
This comes as McDonald's continues its transparency campaign to help turn around struggling sales domestically. During September, the company saw its comparable-store sales drop accelerated to 4.1 percent in the U.S.
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CORRECTION: This story was updated to show that about three quarters of McDonald's U.S. locations are bringing back the McRib cult classic sandwich.