Pecan trees are at the very heart of southern culture. They are one of the only nut trees that occurs naturally in North America, and New Orleans became a major port for their export to the rest of the world in the 17th and 18th centuries. They are still cultivated here in Louisiana, and if you pay attention you'll see pecan trees all over Nola.
So it's only natural for New Orleanians to love pecans. Enjoy them candied, in salads, in pies, or just on their own!
Also, apparently monarchs like to hang out in pecan trees. Who knew?