|1||cup club soda|
|1||cup unsweetened pomegranate juice|
|3||tablespoons fresh Key lime juice (about 3 limes)|
|Key lime slices (optional)|
Combine sugar and 1/4 cup water in a small saucepan; bring to a boil. Reduce heat, and simmer 2 minutes or just until sugar dissolves. Remove from heat; cool. Combine sugar syrup, pomegranate juice, vodka, and lime juice. Place crushed ice in a martini shaker; add about 3/4 cup pomegranate mixture. Cover and shake. Add club soda, strain into a glass. Garnish with lime slice, if desired. Repeat procedure with remaining pomegranate mixture.