The source of Zubrowka's wealth of qualities is a plant of unassuming appearance called sweet grass, holy grass, Seneca grass or vanilla grass, or in Latin Hierochloe odorata. In Poland it is referred to as bison grass (bison in Polish is zubr). Bison grass contains coumarin, a glycoside with a distinctive fragrance, once generally used to flavour tobacco, cakes & beverages. Today, because coumarin has been found to have anticoagulant properties, it is allowed only in tiny amounts which the Polish health authorities deem harmless. Zubrowka contains only about a dozen milligrams of coumarin per liter, derived from an infusion of one or two kilos of bison grass per thousand liters of vodka. The wild-growing grass must be harvested in good weather & at the proper time
- early in the summer, when the grass has reached the proper height & colour, but is still young & not yellowed. At that moment it is most aromatic. The grass is harvested by h&. Then it is allowed to dry naturally in the breeze & sunshine & is bound in bunches, cut to the required length & delivered to the distilleries. In the distillery the grass is spread on screens & vodka is made to flow through the grass several times to make an aromatic essence. During the next stage this bison grass extract is mixed with pure vodka until the right colour, aroma & taste are obtained, following the traditional recipe. The ready vodka is left for several days to stabilise & harmonise. Experienced technicians & tasters monitor every step of the process. Finally the vodka is filtered & the final product is bottled, with a blade of bison grass in every bottle for decoration.