Add the mint, lime juice and simple syrup to a glass and gently muddle. Add the rum and fill the glass with ice. Top with club soda and stir gently. Garnish with a big mint sprig.
*Passionfruit Simple Syrup
Bring 1 cup water and 1 cup sugar to a boil to dissolve. Remove from heat and add 0.5 cup passionfruit. Cool to room temperature. Strain and refrigerate.
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