In a saucepan, bring sugar, apple juice, and apple pie spice to a boil.Cook until sugar dissolves.Remove from heat.Once cool, store in an airtight container and keep refrigerated.
In a glass, add the syrup, bitters, and orange peel.Use a muddler to gently press the orange peel to release the citrus oils.Add the whiskey and stir.Add ice cubes and stir again.