This recipe came from The Country Cook and got a 5 star rating. I'll copy some of the comments as I found them interesting and informative.

Pastrami or Corned Beef? The article says, "I believe the traditional Reuben sandwich is made with corned beef. " Then it goes on to say, "Corned beef is boiled and pastrami is smoked. They are both brined beforehand. Additional seasoning is also put in that brine, (which is basically salt, water and sugar) where it soaks for a long period of time. Then more seasoning is added to the pastrami before it is smoked. They are usually from the same cuts of...