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.
Titoâs Handmade Vodka is made from corn and as a distilled spirit, is completely gluten-free. Some producers add a little bit of mash back into the spirit after distillation, which would add gluten content into an otherwise gluten-free distillate (if using wheat as the base), but I donât do that regardless.