not so much potent (80 proof), it's all about the *flavor*



Żubrówka, (known in English as Bison Grass Vodka) is a brand of dry herb-flavoured vodka distilled from rye, 40% alcohol (80 proof). The raw rectified spirit is then mixed with a tincture made of Hierochloe odorata, often called bison grass. This grass grows in the Białowieża Forest, which is partly in Poland and partly in Belarus. A blade of this grass can be found in every bottle of genuine Żubrówka, but this is only decorative and is not the reason for its particular taste, aroma, and yellowish colour. Its name comes from żubr or zubr, the Slavic word for the wisent, which are particularly fond of the herb. The flavour is unique, and can be described as having vanilla, coconut and almond-like qualities.

http://en.wikipedia.org/wiki/%C5%BBubr%C3%B3wka