[kyllo]

Ever had a dry-aged steak?

[1270018080]

The steaks where they cut off all of the rotten parts so you're not eating rotten meat? Yeah.

[xutopia]

A fermentation process occurs deep within the meat tissue. The outside parts are usually moldy but not rotten if done correctly.

[jjulius]

Right. The entire steak ages and changes, not just the exterior. Even so, some places, like Flannery Beef, will blend some of the ends into their "adventurous" burger blend.