This torta de carnita, topped with a secret tomato sauce, has been served for more than 59 years and is Mexican comfort food taken to the next level. Also flavoring this mouth-watering sandwich? Plain old yellow mustard. I’m addicted to the combination. It's similar to a Sloppy Joe, only with pork and a lot messier. This is a symphony of flavors sandwich lovers will hear over and over in their heads. Bring a big bib and a pocketful of small change.