is a Japanese herbal tea made from fermented leaves of Hydrangea macrophylla var. thunbergii. The name derives from the characters for and .
Amacha means sweet tea. This tea contains tannin and phyllodulcin, a sweetener 400–800 times sweeter than table sugar ( sucrose) or 2 times sweeter than saccharin. It does not contain caffeine. The beverage is credited with antiallergic properties. It is also used in the prevention of periodontitis.
This tea is often used in ceremonies celebrating Buddha's Birthday, in Japanese Buddhism on April 8. At that occasion, Japanese people pour amacha on small Buddha statues decorated with flowers, as if bathing a newborn baby.