Shake on ice, strain in glass of choice. Garnish with Candied Hibiscus Flower (from the jar that is the source of the Hibiscus Syrup!).
I had considered the hibiscus flower/syrup but it was about $20 online and costly to be wrong. However, The Fresh Market has is locally for $5....and it wasn't an error. Well worth $5!
A dash of Angostura or other favorite bitters is an attractive option.