[hoosierham]

Is it ok to put mustard on the burger ? How about horseradish sauce (looks like mayo but bites back!)

I would hate to be hanged in Texas for poor food etiquette.

[dtel]

"Is it ok to put mustard on the burger ?"

What the hell else would you put on a burger?

Horse radish is up to ones own personal preference, of course.

But mayo should never see the toasted side of a hamburger bun.

Mayo on a roast beef sandwich maybe, but never on a burger.

Your mileage may vary and East Texans don't hang 'em as readily as they did in the past. ;^)