How to Make It
Combine first 6 ingredients in a cocktail shaker. Cover and shake 30 seconds or until sugar is dissolved. Add cream and egg white; cover and shake 10 seconds. Add a few small ice cubes; cover and shake vigorously 2 to 3 minutes or until you can no longer hear the ice cubes. Strain into a tall glass. Top with seltzer; garnish, if desired.