McDonald's has lifted the curtain on the McRib, one of its most popular limited-time offerings, in a new video aimed at boosting transparency at the fast food giant.

As part of McDonald's ongoing effort to dispel myths about its food, the company invited a high school teacher who'd tweeted disparagingly about the sandwich to join Grant Imahara, former star of the TV show "MythBusters," to see what goes into the boneless barbecue pork sandwich.