If you visited Palermo you surely know the Spleen Sandwich ( in Italian it si called Pani ca’ Meusa). Maybe what you are not aware of is that this recipe was introduced by Jewish people who lived there during the year 1000 as many of them worked like butchers. They did not waste anything of the cow meat, so they also use to sell the organs and offal.
The original recipe is about boiled spleen served with lemon and salt, but They boiled them and served them with lemon and salt. This was an original street food in Palermo.
Then, since the population mixed also with the Arab one, who added the caciocavallo to the recipe, the sandwich with the spleen took the shape we know today.
So, if you go to Palermo you must taste it once and eat in in one coppo street food shop!( TLCCJ)