The drink is made from strongly brewed Ceylon tea, or a locally grown landrace version of Assam known as bai miang. The tea is sweetened with sugar and condensed milk and served chilled. Evaporated milk or whole milk is poured over the tea and ice before serving to add taste and creamy appearance.
Thai tea as consumed in Thailand is not typically brewed with spices, though many English language recipes inspired by Thai tea include ingredients such as star anise or cardamom to enhance the flavor. It is served either hot or cold. Thai tea is popular in Southeast Asia.
In Thai restaurants it is served in a tall glass. At street and market stalls in Thailand it may be poured over crushed ice in a plastic bag or tall plastic cups. Tapioca pearls can be added to Thai tea to make bubble tea. In Thailand, hot Thai tea is often drunk in the morning, frequently with pathongko.
Condensed milk is cow's milk from which water has been removed, and it is most often found with sugar added. In parts of Asia and Europe, sweetened condensed milk is the preferred milk to be added to coffee or tea.
Assam tea is manufactured specifically from the plant Camellia sinensis var. assamica.
Star anise is a spice from the star-shaped fruits of an evergreen tree native to South China and northeast Vietnam. Star anise contains anethole, the same compound that gives anise, an unrelated plant, its flavor. Anethole has the formula C₁₀H₁₂O. It is distinctly sweet, measuring 13 times sweeter than sugar.
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