noun
leaf mustard; mustard greens
Refers to the plant Brassica juncea var. integrifolia, commonly used in Japanese pickles (takana-zuke).
高菜漬けはご飯によく合います。
Pickled mustard greens go well with rice.
このラーメンには高菜がトッピングされています。
This ramen is topped with mustard greens.
からし菜 is a broader term for mustard greens, while 高菜 specifically refers to the variety used for pickling.
The name 高菜 (takana) literally means 'tall greens,' referring to the plant's height. The exact historical derivation is uncertain.