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.
White Russian Ingredients. With this drink, you are going to fill up your shaker with ice, Then you are going to pour 2 ounces of vodka, an ounce of coffee liquor, and then you are going to top that off with about 1 to 2 ounces of cream. Then you are going to chill that.