"Gluten Tag"
It is a marvelous illustration of the trouble with the WWW to spend a few minutes looking up the origin of the Kaiser roll.
tl;dr --
People like to say it is named after Franz Joseph I but they are wrong.
Now I’m craving a bratwurst, thanks Avi.
And what did the bratwurst say back?
“Nice buns!”
You're all on a roll.
Can you cut the mustard?