mitsuba
/mɪtˈsuːbə/ /ˈmɪts(ə)bə/noun
A small leafy perennial herb, Cryptotaenia japonica (family Apiaceae (Umbelliferae)), native to eastern Asia, especially Japan, where it is frequently used to flavour and garnish food.
Origin
Late 19th century; earliest use found in Vick’ s Monthly Magazine. From Japanese mitsuba from mitsu- three + -ba, combining form of ha leaf.