century, matcha was made by grinding tea leaves in a grinder called a yagen (薬研), but the particles were rough and coarse in texture; in the 14th century...

Yagen (薬研) is a crushing tool used in grinding plant medicines in Asia. It consists of a disk and a boat-shaped mortar. The disk is rolled back and forth...

Yagen Onsen (薬研温泉) is a hot spring located in the former town of Ohata, which is now part of the city of Mutsu in northern Japan. The onsen consists of...