Add the hibiscus syrup and bitters to mixing glass and stir to combine.
Fill mixing glass with ice then pour in the bourbon and stir until chilled to the touch (about eight seconds).
Strain liquid into a rocks glass over a large ice cube.
Peel off a stripe of orange rind and squeeze it over top of the cocktail to express oils then drop peel into the glass for garnish.
Notes
Making the Hibiscus Simple Syrup
Add 1 ½ cup water, 1 ½ cup brown sugar, 1 cup dried hibiscus, 2 inches fresh ginger, 1 cinnamon stick, and 2 whole cloves to a small saucepan over medium heat.
Stir until brown sugar dissolves then bring to a boil.
Reduce heat to low and simmer for about 10 minutes then turn off heat and allow syrup to cool before straining out solid ingredients.
PreparationYou can mix this drink up to two days ahead of time as long as you store it in the fridge or freezer. When you're ready to serve it, give it a store to take care of any separation then pour it over ice.To large batch the drink, combine two ounces of hibiscus syrup with 8-12 dashes of bitters. Add the ice and six ounces of bourbon then stir until chilled. Divide the cocktails between four rocks glasses and express orange oil over each one. Serves four.Cocktail Tool SubstitutionsFor these first steps, you can use acocktail mixing glassandbar spoonor a highball glass and a regular table spoon or butter knife.Instead of a jiggerto measure the liquor and syrup with, you can use a standard size shot glass, which holds about the same amount of liquid as the jigger's large end.If you don't have a hawthorne strainer a mesh strainer also works well. Or you can use another glass to cover all but a sliver of the mixing glass as you pour so that just the liquid comes out.