Uykuluk, namely sweetbread of the lamb, is a very special taste and very Turkish in a manner of kebab. I have never seen another example of this food among the world dishes but I am ambitious to find! The best place you can eat uykuluk is the neighbor called Sütlüce in Istanbul. There are several restaurants (actually they are too small to say restaurants but anyway) along the shore of Haliç. I have been many times in Çınaraltı Restaurant and never got disapointed. Attention: highly addictive!