I don't think I've ever seen a waffle sandwich before, but like Tempty said it makes no sense. Still, after going to Roscoe's in the LBC, I can safely say it works when done correctly. I wouldn't try it anywhere besides a Roscoe's though.
Interesting article. The real Festivus sounds so much more horrifying than the fictional retelling....
https://uproxx.com/tv/seinfeld-festivus-true-story/
Nothing ruins a nice crispy chicken breast than a soggy bun... except for bun that is so toasted it both refuses to take any moisture and scratches your throat to prove it.