Matcha is a finely ground green tea powder made from shade-grown tea leaves, which is traditionally whisked with hot water to create a frothy drink. Unlike steeped green tea, drinking matcha means you consume the entire leaf, which is why it has a more concentrated flavor and higher levels of caffeine and antioxidants. It is a staple of the Japanese tea ceremony but is also used as a versatile ingredient in a wide variety of other foods and drinks.