Thai iced tea is typically made only with black tea, but to achieve its characteristic (usually artificial) color, we add rooibos as well. For Thai iced tea that is closer to the restaurant version in sweetness, use the larger amount of sugar.
In a medium saucepan bring to a boil:
Remove from the heat and add:
Steep for 20 minutes. Strain. Fill 4 tall glasses with ice and divide the tea among the glasses. Pour over the top of each: