1 lime
1 teaspoon cane syrup
2 ounces rhum agricole
Garnish: lime peel
Cut ends off lime. Cut lime into quarters; cut each lime quarter in half.
In an old-fashioned glass, muddle cane syrup and 1 lime wedge until juice is released and lime is very fragrant, about 15 times.
Add a large cocktail ice cube to glass, and add rhum agricole. Stir vigorously until well combined and mixture is very cold, about 30 seconds. Garnish with lime peel, if desired.