In linking a subordinate clause and a main clause, a relative pronoun functions similarly to a subordinating conjunction. Unlike a conjunction, however, a relative pronoun does not simply mark the subordinate (relative) clause, but also plays the role of a noun within that clause.
The main ingredient in most vodkas is some kind of grain, such as wheat, corn or rye. Potatoes are another common base ingredient for vodka, according to About.com.
Vodka is traditionally drunk neat (not mixed with any water, ice, or other mixer), though it is often served chilled in the vodka belt countries (Belarus, Estonia, Finland, Iceland, Latvia, Lithuania, Norway, Poland, Russia, Sweden, Ukraine).t is also commonly used in cocktails and mixed drinks, such as the vodka martini, Cosmopolitan, vodka tonic, Screwdriver, Greyhound, Black or White Russian, and Bloody Mary.