What is ractagino in Star Trek?

"Raktagino", a strong blend of Klingon coffee, was first made famous in the original Star Trek series episode "The Trouble With Tribbles" aboard a Federation space outpost where some Klingons were docked. Very few non-Klingon species ever drank the coffee, barely any Klingons were ever seen replicating or ordering it in later Star Trek series editions, but Bajoran operations commander (later colonel) Nira Kerys of Deep Space 9 often had several cups of Raktagino a day, which is probably why she is on edge all the time.