- Place ingredients in a shaker filled with ice. Seal and shake vigorously for 12-15 seconds and strain into an ice-filled Collins glass. Garnish with orange zest.
- Bring all ingredients to boil over medium heat.
- Reduce heat to medium-low and let simmer for 8-10 minutes until sugar has dissolved, stirring frequently.
- Remove from heat and let cool.
- Discard cinnamon sticks, strain into a clean glass jar and cover. Store refrigerated for up to 2 weeks.