Add white rum, fresh grapefruit juice, fresh lime juice, and maraschino liqueur into a cocktail shaker.
Fill the shaker with ice cubes.
Shake vigorously for 10–12 seconds until well chilled.
Strain into a chilled large cocktail glass.
Serve immediately, ungarnished.
Hemingway reportedly suffered from diabetes and disliked sweet cocktails, so this drink was designed with minimal sugar - maraschino provides just enough sweetness without syrup. For maximum authenticity, use a high-quality Cuban-style white rum such as Havana Club 3 Año.
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