This is a great drink, with or without the bourbon. Try it, you will be pleasantly surprised.
Chill four glasses in freezer.
Combine pineapple and grapefruit juices into a large pitcher along with the grenadine and mix well.
Add ginger ale and bourbon, if using and pour into chilled glasses, garnishing with a skewer of fresh wedged pineapple, grapefruit, and lime topped with a marashino cherry.
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