In a small saucepan over medium heat, combine the sugar and water. Bring to a simmer, stirring until the sugar is dissolved. Add the fresh rosemary and turn the heat down to low. Simmer for 2 minutes and then remove from the heat. Cover and let the rosemary steep for 30 minutes.
Strain the simple syrup and discard the rosemary. Cool completely before using.
Rosemary Aperol Spritz
Fill a wine glass half full with ice cubes. Add the Aperol and the rosemary simple syrup. Top with the Prosecco and a splash of sparkling water. Garnish with a slice of fresh orange and another sprig of rosemary. Enjoy!
Notes
Note: I typically don't measure the Prosecco and sparkling water when making this drink. The measurements given will yield the correct ratio for the drink if you prefer to measure.