Black tea is a fully oxidized leaf that varies mainly in processing style and growing region. The major regions in which black tea is grown include China, India, and Sri Lanka. Varieties produced in these countries include Darjeeling, Ceylon, Keemun, Lapsang Souchong, Yunnan, and Assam, just to name a few. Recent additions to the family of countries that produce black teas include Kenya, Argentina, Thailand, and, yes, even the United States.
Black tea is made from the leaves of the Camellia sinensis shrub. Black tea is the most popular in the US and enjoyed mainly as an iced tea.
The flavor of black tea varies greatly; some are flowery, some malty, some spicy, and some nutty. Generally, black teas should be steeped using boiling water for three to five minutes (with a few exceptions).