Erick Castro muddles plenty of mint leaves with simple syrup, shakes the drink, then pours it through two strainers to remove any particles. The result is a perfectly silky cocktail.
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In a cocktail shaker, muddle 7 of the mint leaves with the Simple Syrup, then add the gin, lime juice, bitters and salt. Fill the shaker with ice and shake well. http://www.foodandwine.com/articles/cocktail-basics-techniques#doublestr... title="Cocktail Guide: Double Straining">Fine strain into a chilled coupe and garnish with the remaining mint leaf.