Recipe from the World Class bartender on Celebrity Silhouette, Johnny.
1oz freshly squeezed lime juice
1oz simple syrup
1oz egg white
Combine ingredients in cocktail shaker and shake vigorously for 10sec. Add ice and shake again. Strain into chilled cocktail coupe (or martini glass) and add 1 dash (9 drops) Angostura bitters to the egg foam.