2 oz vodka
1 1/2 oz lime juice
1 dash bitters
1 tsp superfine sugar
3 oz club soda

Add the lime juice, sugar, vodka and bitters to a cocktail shaker half-filled with ice cubes, and shake well. Almost fill a collins glass with crushed ice and stir until the glass is frosted. Strain the mixture from the shaker into the glass, and add club soda. Serve with a swizzle stick.