Step 1
Prepare the turbinado syrup. In a small saucepan, bring turbinado sugar and water to a boil. Stir constantly until sugar dissolves. Reduce heat, and simmer for 6 to 8 minutes. Remove from heat and cool completely.
Step 2
Add lime juice, orgeat, turbinado syrup, dry curacao, white rum, and ice into a shaker. Shake for 15 seconds.
Step 3
Pour mixture into two glasses filled with ice. Float the dark rum slowly pouring over the ice. Garnish.
Turbinado syrup can be refrigerated in an airtight container up to 1 month.