A strong Klingon coffee that became the everyday drink of Deep Space Nine's crew, served hot or iced at Quark's and at the replimat on the Promenade.
Raktajino is a dark, potent Klingon coffee. Despite its origin it is hugely popular with other species, and aboard Deep Space Nine it is ordered far more often than anything from Earth.
The drink appears throughout Deep Space Nine. Benjamin Sisko, Kira Nerys and Jadzia Dax all start their days with it, and Miles O'Brien and Julian Bashir drink it at the replimat. Quark serves several versions at his bar, including an iced one.
Raktajino is also mentioned aboard other Starfleet ships and stations of the period, a sign of how far Klingon tastes spread through the Federation during the long alliance.