Southside

1½ oz Hendrick’s Gin
1 oz Paula’s Texas Lemon
¼ oz fresh lemon juice
2 sprigs fresh mint
1½ oz well-chilled club soda

Gently muddle 1 of the mint sprigs with the lemon juice in the bottom of a mixing glass. Add the gin and Paula’s Texas Lemon and shake well. Pour over crushed ice in a goblet and stir until the outside of the glass frosts. Top with a splash of soda—up to 1½ ounces, to taste—and garnish with the other sprig of mint.

Similar
Austin Daisy (+lemonade; -mint, club soda), The GTL (-lemon juice, mint), White Lady (-mint, club soda), Corpse Reviver No. 2 (+Lillet Blanc; -mint, club soda), Mom’s Collins (+parsley; -mint), Gin Fizz (+syrup; -citrus liqueur, mint), Water Lily (+Crème de Violette; -mint, club soda)
Source
http://pts.nwalsh.com/newsletters/June2009.htm