Sarsaparilla (UK: /ˌsɑːrspəˈrɪlə/, US also /ˌsæspəˈrɪlə/ sas-pə-RIL-ə)[1] is a soft drink originally made from the vine Smilax ornata (also called 'sarsaparilla') or other species of Smilax such as Smilax officinalis.[2] In most Southeast Asian countries, it is known by the common name sarsi, and the trademarks Sarsi and Sarsae. It is similar in flavor to root beer. In the US, sarsaparilla is traditionally made with birch oil rather than the tropical plant.