Vodka may be distilled from any starch- or sugar-rich plant matter; most vodka today is produced from grains such as sorghum, corn, rye or wheat. Among grain vodkas, rye and wheat vodkas are generally considered superior. Some vodkas are made from potatoes, molasses, soybeans, grapes, rice, sugar beets and sometimes even byproducts of oil refining or wood pulp processing. In some Central European countries, such as Poland, some vodka is produced by just fermenting a solution of crystal sugar and yeast. In the European Union there are talks about the standardization of vodka, and the Vodka Belt countries insist that only spirits produced from grains, potato and sugar beet molasses be allowed to be branded as "vodka", following the traditional methods of production.