Tropicoma was "invented" in 2004 by myself and Cocktail, a member of Team JPC who lives in Brisbane, Australia. It's recipe has not changed since it's first inception and is still known only to the two of us!
All I can say is that it is a mixture of premium brand spirits and other alcaholic beverages, combined with exotic fruit juices. The trouble is, it is just too easy to drink!
Remember, The Liver Is Evil And Must Be Punished!