Make the hibiscus syrup first. Bring water to a boil in a small pot.
Add dried hibiscus flowers and sugar. Stir until sugar dissolves.
Remove from heat and let steep for 20 minutes. Strain and cool completely.
Fill a cocktail shaker with ice. Add tequila, hibiscus syrup, lime juice, and simple syrup.
Shake for 15-20 seconds until well chilled.
Strain into a highball glass filled with ice.
Top with a splash of club soda and stir gently.
Garnish with a dried hibiscus flower and lime wheel.
Notes
The hibiscus syrup keeps in the fridge for up to 2 weeks in an airtight container.Use 100% agave silver tequila for the best results.Make sure all ingredients are cold before mixing for the ideal temperature.For a spicy twist, add 2-3 thin jalapeño slices to the shaker.Double strain if you want to remove small ice shards from the final drink.