This sandwich is "owl"

This sandwich will explode your face. The link I've posted is to a Google-translated so he keeps talking about a "crunch-Mister" which I believe is a croque monseur--but honestly, my French is a little rusty (read: nonexistant). I'm going to try to get my friend JR, who just returned from Paris, to take a look at the page for me and translate such phrases as:

"It was owl.! Really owl, owl, owl."

I hope this doesn't mean that the guy used owl eggs.