(written from a Production point of view)
According to a cut scene from "Strange Bedfellows", Koganka pudding was a Bajoran dessert. It was Bajoran tradition to give the koganka pudding to a soon-to-be bride. Kasidy Yates received a number of bowls of the pudding while she sat at Quark's following the announcement of her upcoming marriage to Benjamin Sisko in late 2375. (Star Trek: Deep Space Nine Companion - A Series Guide and Script Library, )
According to Star Trek: Celebrations, "Koganko" pudding is a Bajoran offering that symbolizes their desire for children.