@Jean
When you come out of a night of fraternizing, you definitely want to try a pljeskaviča sandwich with kajmak and ajvar.
For fraternizing, my ideal spot in srbija is a kafana. Essentially a traditional restaurant where you eat and drink a lot for a long while, then when everybody is full and … uh… happy, a group of very loud musicians comes in and starts playing really loud and really fast Balkan music.
Then all guests proceed to happily and different degrees of drunkenly dancing for hours on end, usually on the tables.
You definitely, 666% want to do it.
The secret is, while you are having dinner, to ALWAYS drink a full glass of water for every glass of rakija - memorize this as it is a life saver. You will go to the toilet 262736 times. You will still thank me for this advice.
Last, but definitely not least, I suggest you go here for lunch
https://maps.app.goo.gl/iYk7hG6qb9PNBUCY6?g_st=ic
They make roasted intestines, it is FANTASTIC. Assuming you are in for this kind of stuff, I mean not everybody likes it.
But if you do, this is going to be a life highlight.
They also serve very good sweetbreads and general cevapi / karadjorjeva etc in case you like something tamer