Chasen

A chasen is a traditional Japanese whisk carved from a single piece of bamboo into dozens of thin tines. It is the standard tool for preparing matcha, used with a brisk back-and-forth motion in a wide bowl rather than stirred in a narrow mug.

The fine tines break up clumps of powder and beat air into the liquid at the same time, which is what creates the light foam on a well-made bowl of matcha. A whisk with fewer or thicker tines struggles to fully dissolve the powder and produces a flatter, less even texture.

When buying, soaking a new chasen briefly before first use helps the tines hold their curve, and a small holder helps it dry in shape between uses. A common mistake is leaving it wet and bundled in a cup after use, which can crack or mold the bamboo, or whisking too gently to build any real froth.