"Sarma" is the oldest dessert and you can't find this dessert anywhere except Fatih. Fatih Sarmacısı is the best one. This tiny place is located the same place since founded. It has different Turkish desserts like baklava but there is one thing you should not miss, that is "Sarma".
Fatih Sarması is the best answer. This place is also close to Fatih Mosque and some traditional and local food places.
This is an eat&go place!
Mon-Su: 09:00-21:00