Step 1.
- In a shaker, combine light rum, dark rum, orange liqueur, orgeat syrup, and fresh lime juice over ice.
Step 2.
- Shake well until chilled.
Step 3.
- Strain into a double old fashioned glass filled with crushed ice.
Step 4.
- Float dark rum on top by pouring it over the back of a spoon.
Step 5.
- Garnish with a fresh mint sprig and a lime wheel.