Birch kvass is a source of health.

An all useful of birch keeping in kvas. As his cooks in big dish or in plastic bottles,as to filtered birch juice add over fried barley on tbl.sp. for 20 l, or rusks or rye bread or crusts, handful of dried apples and lemon peel, bee combs, twig of black currant by selection, and for 4 weeks infuse in cool place, filter, drink,add sugar or honey, cold into keeping.
By Kornjakova, valeologist,Dr.