you can find lots of interesting stuff in Istanbul. There are many different kinds of people living here, many different kinds of cuisine and many different cultural things to experience. If you go to the different sections of the city you will find there are different kinds of people living there. I found one such area where the Uyghur people evidently live and work and where you can find that kind of local food.
https://en.wikipedia.org/wiki/Uyghur_cuisine