Step 1

Combine the sugar, 1 cup of water, lime leaves, and lemongrass in a saucepan over medium heat. Allow the simple syrup to steep for 10 minutes. Strain the leaves and lemongrass pieces from the liquid. Let it cool for 10 minutes.

Step 2

Combine the cooled syrup with 3 cups of cold water and 1 cup of ice. Stir in the lime juice. Serve over ice with lime wheels, if desired.