Roasted oolong tea is produced in Nantou County at an altitude of 600–1000 meters above sea level, where the mountain peaks are always covered by clouds. Irrigation and cultivation are done by the local aborigines. The tea is then hand-harvested, with careful selection of tea stems that have two or three leaves. The infusion of roasted oolong tea leaves has a clear amber-yellow color and a strong, distinctive roasted aroma. From the very first sips, it provides a pleasant and intriguing long-lasting aftertaste that keeps repeating with subsequent brews.