Favorite thing: Maybe buying foish is not so easy as buying vegetables, but the street market is a good place to try your skills. Usually, fish is sold in the same day so it should be fresh and, if it is not, at least you may examine the product before choosing. .... until new stupid and overprotective "hygiene" rules will pretend to better defend the consumers (at the same time that they kill the small scale producers)
Street markets are for sure the best place you may think about when you want to have an idea on how people live. And the place where most of the traditional food still resist the impact of supermarkets or those shameful inventions called "commercial malls", "commercial centers" or similar destroyers of our biodiversity and culture.
Fondest memory: Ballaro' market lies between the Cathedral and via Maqueda, roughly speaking.
Favorite thing: Fresh vegetables and fresh fruits are great. Prices are not anymore the insignificant amounts they were up to just a few years ago, but this is a good sign as it was unfair the producers received so little money for their work.
To get the real soul of Palermo, take a walk at its markets. Almost every street is absorbed in some kind of chaotic and probably dubious commerce. Try the Mercato delle Pulci, for antiques and beautiful old handmade tiles.
But the maddest, smelliest and best market runs through another notorious neighborhood, the Albergheria. Via del Carmine is the bent and twisted spine of this fabulously seedy district. The church of Carmine is worth the visit too.
Favorite thing: A tipical open market from back streets of Palermo.. It's quite small compare to others, since it's in the city center.. People are doing shopping for shorter money here...