Make the simple syrup:  Combine sugar, lime juice and ginger in a small saucepan.  Bring to a boil, reduce heat and simmer a few minutes.  Set aside to cool.  If you want a bit sweeter simple syrup use 1/2 cup lime juice and 1/2 cup water.

To make the cocktails: Combine cocktail ingredients except club soda in cocktail shaker filled with ice. Shake well and pour into 2 glasses filled with ice.  Top each drink with club soda.