Make the hibiscus tea by steeping dried flowers in hot water for 5 minutes. Strain and let cool.
Fill the cocktail shaker with ice.
Add vodka, cooled hibiscus tea, lime juice, and simple syrup to the shaker.
Shake vigorously for 15-20 seconds until well chilled.
Strain into a chilled martini glass.
Garnish with a lime wheel or dried hibiscus flower.
Notes
The tea can be made ahead and stored in the fridge for up to 3 days.A stronger tea creates a deeper red color and more intense flavor.The drink can be made sweeter by adding more simple syrup in 0.25 oz increments.For a non-alcoholic version, replace vodka with cold sparkling water and serve over ice.