[Request] Crab back, as seen in Anthony Bourdain's Parts Unknown

I was watching the Bay Area episode of Parts Unknown and saw this dish they called crab back, here's a gif I took - http://ift.tt/1N0bY6l

What exactly is this? Butter melted in to the stuff left in there? Should anything in particular be pulled out before eating? I searched online but only found stuffed versions of crab back.

bon appetit