Freely, I am gonna bet you that you havent ever tryed anything more delicious than this Bosnian/Sarajevo National meal.
They are made from two types of minced beef meat, hand mixed and formed with a funnel.
Formed ćevapi are grilled. They are served with somun, special kind of bread especially made for being served with Ćevapi, plus do not miss the Kajmak, the additional cream on top of everything else to have the craziest beautiful feeling while eating them.

Ćevapi, Sarajevo and B&H traditional meal
Also yoghurt is great addition as well.
You would eat the in specialized shops called Ćevabdžinice, where they are served as the primary product, so I guess there are the best.