is soft and wonderful.  I like the kind with cream and pistachios.  The best thing is to get it where they make it.  There is a spice bazaar down the hill next to the Golden Horn, down by the train station.  They roll it up with the cream right in front of you.  

And if you can, hear the last evening call to prayer standing in front of Haghia Sophia (one one side) and the Blue Mosque (on the other).  The muezzin in the Blue Mosque is the best one I have ever heard -- a stunning voice.  And being there in the evening, after dark, when most of the tourists and touts have gone away, is absolutely magical.  The Museum of Turkish and Islamic Art (which is in a Pasha's palace next to the Blue Mosque) has the most incredible carpets -- huge and stunning.  And an amazing collection of pottery and tiles as well.  If you had longer I would strongly recommend the beautiful Church of Christ in Chora, from which it is an easy walk to where the walls were breached in May of 1453 by the attacking Ottomans.  The best Iznik-style tiles and pottery are on sale just opposite the church.  But you have to go to Haghia Sophia, which is stunning, and the Blue Mosque and if you can do it, the Suleimaniye, the mosque complex built by Sinan (the architectural genius who was a contemporary of Michelangelo) for Suleiman the Magnificent.  I like Topkapi, but it seems the great buildings of Haghia Sophia and the two great mosques would be higher on the list.  For me, anyway.