The iced tea can be refrigerated in a covered pitcher for up to 2 days.
Lemongrass, used often in Thai and Vietnamese cuisines, is a perennial herb with an aromatic lemony flavor. The only edible part of the long, grassy stalks is the tender, inner bulb, which is most often used in cooking. For this tea, however, the whole stalks are used because they are strained before drinking.
Store fresh lemongrass stalks for up to 2 weeks in the refrigerator wrapped in plastic, or freeze for several months.