Though this area is best known for Oolong teas, we find a unique tea decades in the making. Native Formosan cultivars crossed with Assam plants provide a complex blend of smooth, sweet and floral flavors with a hint of maltiness from the Assam. Insider Tip This is a fabulous gateway tea for coffee lovers! It is complex and flavorful. It is perfect for multiple infusions; start with shorter infusions (1-2 minutes) and infuse longer each time. We get notes of sasparilla. . . what do you think? Caffeine Level Medium/High. Learn More: 18 Ruby is a black tea from Taiwan, in development for 48 years. First developed in 1984, 18 Ruby was the result of many years of research by TRES (Tea Research & Extension Station). Black teas from Taiwan are almost never produced, yet this one is full-bodied, slightly sweet, fruity, and aromatic, with a hint of licorice. A hybrid of Taiwanese Original Wild Tea and Burma Assamica, this tea is entirely hand-processed.