Green’s Dictionary of Slang

(Aus.) sarsparilla, the dried root of Smilax officinalis, at one time used as a tonic.

1936		Queenslander (Brisbane) 2 July 49/3: When you who leave with pockets lined with ‘brass,’ / Among the mob sit sipping beer and sarse, / And in your tale of ‘touches’ reach the part / Where I made one - turn down an empty glass.
1953		Baker Aus. Speaks.