Make hibiscus ginger simple syrup
Combine simple syrup ingredients together in a small saucepan and cook over medium heat for about 5 minutes or until sugar is dissolved. Remove from heat, strain out ginger and hibiscus and discard. Set aside infused syrup to cool.
Make the cocktail
In a cocktail shaker, add gin, lemon juice, egg white, and hibiscus ginger simple syrup. Shake vigorously for 30 seconds or until foamy. Add ice and shake for another 20 seconds. Strain into a coupe glass.