"Opinicus" scripsit in
:

Where and when did this pretzel-mustard tradition get started?

In Germany? Actually, it appears to come from Philadelphia (in a
mythical country called the Untied States).

"In Philadelphia werden sie dagegen weich und frisch gebacken und mit
Senf serviert."

http://de.wikipedia.org/wiki/Brezel

--

"The modern conservative is engaged in one of man's
oldest exercises in moral philosophy; that is, the
search for a superior moral justification for
selfishness." -- John Kenneth Galbraith