Combine 1 cup of sugar and 1 cup of water in a saucepan. Cook over medium heat, stirring contantly, until sugar dissolves. Bring to a boil. Boil 15 minutes or until reduced to 3/4 cup.
Place gin, Simple Syrup, lemon juice, and ice in a cocktail shaker. Cover with lid and shake until thoroughly chilled. Strain into a highball glass filled with ice cubes and finish with club soda. Garnish with rosemary sprig.
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