comment: >
  
  Mayo is sometimes used instead of butter for outside the bread to fry. I haven't yet tried it, but I've seen it done. It gives the bread a good crisp.
context: I guess butter isn't allowed >
  
  Imo, butter or mayo on the bread in order to toast it is more of the cooking method vs an additional ingredient in the sandwich. >
  
  MAYO?!
  Not judging, but genuinely curious because I’ve never heard of this! 😃 Before or after it’s cooked? What does it do?