I remember Prem from about fifty years ago. It was a Spam look-alike
and as mentioned by Dawn, it slid out of the can, probably due to more gelatin (pigs' feet?) om the mix. If you think Spam is salty, you should have tried Prem. I hadn't thought of it in decades, but I know if sodium content on labels was required for Prem, a serving size portion would be four digiits if not five!