Fill cocktail shaker half full with ice. Add gin, egg white, lemon juice, simple syrup and crème de violette. Shake about 30 seconds. Strain into cup; discard ice. Return to shaker; shake about 45 seconds. Pour club soda into a glass. Strain into glass, allowing foam to rise.
TO DRINK:
1 ½ fl. oz. gin
1 egg white
¾ fl. oz. lemon juice
¾ fl. oz. simple syrup
½ fl. oz. crème de violette
1 ½ fl. oz. chilled soda water
TO WEAR:
1 part Bathtub Gin
1 part Extrait de Violet
1 part Lemon Grove