" Polish pamphlet called The Perfect Distiller and Brewer, published in 1809, described the process of distilling vodka from potatoes, with the warning that it was the worst kind of vodka, behind vodka made from sugar beets, grains, apples, grapes, and acorns. In fact, potatoes only became a common ingredient in Polish vodka because they were cheap and abundant, not because they made a high-quality spirit. They tended to turn into a thick, sticky paste in the fermentation tank, the starch was not easy to convert to sugar, and they produced higher levels of toxic methanol and fusel oils. Russian vodka makers looked down on cheap Polish potato vodkas; to this day, they insist that the best vodka is made from rye or wheat instead. "

― Amy Stewart , The Drunken Botanist: The Plants That Create the World's Great Drinks