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Other ingredients may include allspice, birch bark, coriander, juniper, ginger, wintergreenWintergreen Gaultheria procumbens Ericaceae) is a woodland plant with red berries, white flowers and evergreen leaves. Its leaves contain methyl salicylate, an ester related to aspirin, with a characteristic medicinal smell and painkilling properties., hops, burdockArctium lappa A. minus A. minus nemorosum A. pubens A. tomentosum Burdock refers any of a group of perennial flowering plants in the Genus Arctium thistles in the Daisy family Asteraceae. Burdock grows wild throughout most of Europe and Asia, where it is root, dandelionTaraxacum officinale ''Taraxacum japonicum ''Taraxacum albidum and a few others. The Dandelion ( genus Taraxacum of the family Asteraceae) is a tap-rooted annual or biennial plant, found in most temperate zones. Distribution and Etymology Dandelions were root, spikenardSpikenard Scientific classification : Plantae : Magnoliophyta : Magnoliopsida : Dipsacales : Valerianaceae ''Nardostachys ''jatamansi Spikenard (also nard and muskroot is a flowering plant of the Valerian family that grows in the Himalayas of India and Ne, pipsissewa , guaiacumGuaiacum is a genus of plants of the Zygophyllaceae family that includes the lignum vitae tree, G. officinale''., spicewood , yellow dockYellow Dock Rumex crispus is a plant with smooth curly leaves and a yellow root, which is used medicinally as an astringent and tonic., honeyHoney is a sweet and viscous fluid produced by bees and other insects from the nectar of flowers. The flavor and color of the substance is largely determined by the type of the flowers from which the nectar is gathered. Common flavours of honey include or, clover, cinnamon, prickly ash bark, yucca, quillaja , and dog grass .
Due to the wide variety of ingredients possible the flavor of root beer is widely variable between brands. This is especially true of local brands.
Root beer was a traditional beverage and herbal medicine. The beverage was often alcoholic, usually around 2%. As a medicine it was used for cough and mouth sores. Commercially prepared root beer was developed by Charles Elmer Hires on May 16, 1866. He presented root tea powder at the 1876 Philadelphia Centennial exhibition. In 1893 he began selling bottled carbonated root beer.
Home-made root beer is made using flavoring (either a concentrate, or actual roots and spices) to which is added sugar, water, and yeast. It is allowed to ferment under pressure to retain the carbonation and limit the alcohol produced by the yeast to low levels.