sā sih
沙示 (Sarsae) is the name of the most popular brand in Hong Kong, also part of the brand 亚洲沙示 (Asia Sarsae) in mainland China. In Taiwan, the dominant brand HeySong Sarsaparilla (黑松沙士) spells sarsasparilla as 沙士, which has the same pronunciation in Mandarin but different second tone in Cantonese (sā sí).
Sarsaparilla) is a soda similar to root beer, made with the sarsaparilla plant or other Smilax vines.