Grandpa Branham's Peppered Pork Tenderloin

Oh man did I get a gem this weekend.  When I arrived at my brother's house he had a special treat that had been slow cooking all day waiting for us!  He asked me if I had ever remembered eating Grandpa's poor boy sandwich before.  I remember eating so many things at his house but I couldn't place this dish...until I put it in my mouth...this was one that taste just like their kitchen.  Some foods just take you back!  Grandma and Grandpa LOVED pepper rings, and this dish is so easy and simple to make, you all have to try it!
Dad and Daine (my brother) say that Grandpa made this one up himself, which doesn't surprise me!  He knew good food!

This is all there is to it:
In a crock pot, place 1 pork tenderloin. (Daine bought the biggest one he could find to feed 12 people).
Over the top pour 1 large jar of mild pepper rings.  Let this cook all day and then just stir it to pull it apart.  He served it up Poor Boy style on a hoagie bun.  It didn't need another blame thing on it - it had so much flavor, but you can dress this sandwich up any way you like.  I know Grandpa would have!