a Polish Kiss ). It is sometimes served over vanilla ice cream . A Black Bison is Żubrówka mixed with black currant juice. Another common mixer is ginger ale .   References ^ Gim, Sarah, Zubrowka is bison grass vodka ,   http://www.slashfood.com/2006/07/18/zubrowka-is-bison-grass-vodka/ , retrieved 2007-09-29  ^ JD Wetherspoon's Cocktail and