Matcha whisk, known as a "chasen" in Japanese, is a traditional tool used to prepare matcha tea. It's usually made from bamboo and has a handle with several thin, delicate prongs. When whisking matcha powder into hot water, the chasen helps to dissolve the powder fully and create a frothy, smooth consistency. The design of the whisk allows for a gentle, effective blending of the matcha, which is essential for achieving the proper texture and flavor. Using a chasen is a key part of the traditional Japanese tea ceremony and is also a common practice for making matcha at home.