Chill a coupe glass.
Combine the white rum, lime juice and grenadine in a shaker.
Add ice and shake hard for 10–12 seconds until well chilled.
Fine-strain into the chilled coupe.
Serve without garnish.
In 1936 the New York Supreme Court ruled that a Bacardi Cocktail served in New York had to be made with Bacardi rum — a decision bartenders have quietly ignored ever since. Use a real pomegranate grenadine; the artificial stuff makes this taste like cough syrup.
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