When it comes to ribs, there are basically three options available -- the large and meaty spare rib, the smaller but more tender and lean baby back rib, and the St. Louis spare rib (in which the sternum bone and cartilage have been removed from the top of the rib to create a more uniform, rectangular rack).  Today we are focusing on the latter with a "how to" video from our friends at Pork Barrel BBQ.