Step 1.
- Fill a shaker with ice.
Step 2.
- Add the light rum, dark rum, cinnamon syrup, falernum, lime juice, and grapefruit juice into the shaker.
Step 3.
- Shake well until chilled.
Step 4.
- Strain into a tiki mug filled with crushed ice.
Step 5.
- Garnish with a mint sprig and a slice of orange.