I have searched countless times for a Sicilian pastry named "Ciarduna" and nobody seems to know what it is. Ciarduna are cookies made from ground almonds that are wrapped around tubes, much like cannoli and filled with either a sweet ricotta or mascarpone mixture. This is apparently a recipe that has been kept a secret by those few bakers who introduced it to the States. There is even a link to further describe the pastry itself: http://en.wikipedia.org/wiki/Ciarduna.
So far none of the books on Sicilian cookery and confectionery tell of this fabled classic. It's obvious that those savvy Sicilians prefer not to divulge to anyone their secret formulas