Bosnian-style coffee usually comes with a sugar cube on the side, which many drinkers dip or hold in the mouth while sipping rather than stirring it in.
Bosanska kafa is finely ground coffee slow-simmered unfiltered in a small long-handled copper pot called a džezva, poured into tiny cups with the grounds left to settle at the bottom. It's served strong and unsweetened, often with a cube of lokum on the side, and drunk slowly over long conversation.
Why it's made this way: Sandžak's centuries under Ottoman rule and its majority Bosniak Muslim population gave the region a coffeehouse culture built around this slow-brewed ritual, distinctly more Bosnian-Ottoman than the plum-brandy hospitality found in the rest of Serbia.