Kosher vodka can be made from anything. But vodka specifically for Passover can't be made from grain. Potatoes would be fine, but when Royal Wines, a major producer and distributor of kosher wines and spirits, decided to offer a kosher vodka, they wanted something with a little more flair. So they asked Jamaican rum distillery C.J. Wray Nephew to produce a kosher sugarcane vodka for the Kedem label.
It isn't any sweeter than other vodkas—just smoother and more flavorful. We say it tastes pretty much like all vodka, which is to say not much like anything but, well, vodka. But simply as a concept—and as an expression of cross-cultural cooperation with a kick—it's pretty hard to resist.