It has come to my attention, gentle readers, that I told you to go forth and make Portuguese Pot Roast, but I did not tell you what to do with the leftovers. Making a sandwich seems obvious, but I recommend you use my method as outlined above. Trust me: you think it's just a sandwich, but my method is superior to all other methods.
You must use whole-grain bread, and you must layer the ingredients as shown. It's important that you use either grainy or Dijon mustard - none of that nasty yellow stuff is allowed.
If you want to leave the condiments and utensils on the counter to facilitate coming back for a second sandwich, I won't tell anyone.