2 ounces gin
¾ ounce simple syrup
½ ounce heavy cream
½ ounce lemon juice
½ ounce lime juice
3 dashes orange flower water
1 fresh egg white
Club soda, chilled, to top
Add the gin, simple syrup, heavy cream, lemon and lime juices, orange flower water and egg white into a shaker and dry-shake (without ice) vigorously for about 10 seconds.
Add ice and shake for at least 15 seconds, until well-chilled.
Strain into a Collins glass.
Pour a little bit of club soda back and forth between the empty halves of the shaker tins to pick up any residual cream and egg white, then use that to top the drink.