3/4 cup fresh lemon juice
2/3 cup sugar
1 cup (packed) fresh mint leaves
1 cup bourbon
2 10-ounce bottles of chilled club soda
6 cups crushed ice
8 fresh mint sprigs
Mix fresh lemon juice, sugar, and fresh mint leaves in small bowl until sugar dissolves; press on mint with back of spoon to crush lightly. Let stand 30 minutes. Strain mint and lemon mixture into pitcher. Mix in bourbon, then club soda and ice. Pour into 8 tall glasses. Garnish each drink with mint sprig.