Bring the water to a boil over high heat in a medium saucepan.
Add the lemongrass and boil rapidly for 5 minutes. Reduce the heat to low and simmer the tea for an additional 5 minutes.
Strain the stalks from the liquid. Stir in the sugar until dissolved.
Serve warm, or chill in the refrigerator and pour over ice.
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Notes
This recipe calls for roughly chopping the lemongrass stalks. So, what does that mean? If something is to be finely chopped, the pieces should be smaller than bite sized, and for roughly chopped, the pieces should be slightly bigger than the finely chopped size.