Shake all the ingredients with ice and serve in a large goblet. Decorate with tropical fruit if it is available.
Passoa is a passion-fruit liqueur from the French, who love the flavor and make wonderful liqueurs with it. Passoa is a terrific mixer, especially in rum drinks, but it will mix with many different spirits. Try to find special ceramic pineapple glasses to serve this, or if you're really ambitious, go to the gourmet grocery and get miniature pineapples, hollow them out, and serve in them. Be very careful when scraping out the fruit that you don't puncture the skin.