This is Cuba's signature libation. A frequent visitor to the tropics, Ernest Hemingway named this his beverage of choice.
Combine mint leaves, sugar, and lime juice in a small mortar bowl; crush mint using a pestle. Transfer mint mixture to a tall glass.
Add rum, and stir; add ice cubes. Add a splash of club soda.
Note: If you don't have a mortar and pestle, simply use the back of a spoon to crush the mint leaves in your glass with the sugar and lime juice.
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