Passion fruit syrup can be difficult to find. We located a bottle by contacting a distributor, Fee Brothers. (Call 800-961-3337 or write to [email protected]) Because the syrup is hard to come by (and artificially flavored) we devised a substitute for it that was well received: a tablespoon of passion fruit sorbet (Häagen Dazs makes one) and a teaspoon of grenadine, per serving.

Ingredients

　　1 ounce light rum

　　1 ounce dark rum

　　1 tablespoon passion fruit syrup

　　Juice of 1/2 lime

　　1 teaspoon superfine sugar, or to taste

　　Ice cubes

　　Mix all ingredients except ice in shaker. Stir to dissolve sugar. Add ice cubes, shake well, and strain mixture into a cocktail glass.