Usucha (薄茶) translate to “thin tea” in Japanese and is a traditional tea ceremony preparation of matcha made simply with water, characterised by a light, frothy, slight umami and bitter taste.

Matcha powder : Origin - ISUZU Ceremonial Grade Matcha from Marukya Koyamaen (Japan)

https://www.marukyu-koyamaen.co.jp/english/company.html