Shake ingredients well with ice and strain into highball glass over the rocks. Fill with soda water and garnish with peel. The egg white, while traditional, is optional, but provides body and texture. If the egg white is used, it should be shaken especially vigorously for the best results.
Variations include the Ramos Gin Fizz, popularized in New Orleans, for which the egg white is essential. Another variation is the Gin Rickey, which substitutes lime juice to taste for the lemon juice, omits all added sugar and the egg white, and is served in a highball glass.