Gin And Bitter Lemon

1 1/2 oz. Gin

1/2 oz. Lemon Juice

1/2 tsp. Sugar

4 oz. Tonic water

Special instructions:
In a shaker half-filled with ice cubes, combine the gin, lemon juice, and sugar. Shake well. Strain into a highball glass almost filled with ice cubes. Top with the tonic water.