Post #652516 by christiki295 on Tue, Sep 18, 2012 6:01 AM

Wikipedia's take:
It was purportedly invented at the Trader Vic's restaurant in Oakland, California in 1944. Trader Vic's rival, Don the Beachcomber, claimed to have created it in 1933 at his then-new bar named for himself (later a famous restaurant) in Hollywood. Don the Beachcomber's recipe is more complex than that of Vic's and tastes quite different.
Citation: Charles A. Coulombe (2005). Rum: The Epic Story Of The Drink That Conquered The World. Citadel Press. p. 258.