Hail Prem! It was one of the two pretenders to the Spam crown, the other being Treet. The exact composition of Prem is unclear, but I'm guessing it was much like Spam. Compressed pig-related meat parts formed into rectangles with rounded corners, packed in gelatinous mucus. Not exactly technically meat, but meat in an interesting abstract sense. It may have failed because people realized that Prem backwards was Merp.