I'm wondering if this question will cause some of the same commotion that questions about cheesesteaks cause on the Philadelphia Board.
A bar/restaurant in Philadelphia has been serving po' boys, muffulettas, and other New Orleans fare. Now before you scoff, they are making an attempt at "authenticity" (there's that word again) by importing Leidenheimer rolls. Their muffuletta is comprised of, "salami, ham, mortadella, swiss, provolone, olive salad".
I know that everyone's definiton of "authentic" or "traditional" will vary, but I'm asking because I have been to New Orleans a few times and have had muffulettas at both Progress and Central Grocery and I don't recall having Swiss cheese on either sandwich. However, I do remember seeing it listed as an ingredient on Napoleon House's menu description.
Lastly, seeing that the sandwich itself is of Italian/Sicilian invention, that also makes me wonder where the Swiss cheese may have come from.
And if this doesn't stir up enough debate, I will leave you with this...cold or warm?