The story
Borrowed from Cantonese 塌菜 (taap3 coi3, “collapsed vegetable”).
Etymology from Wiktionary, CC BY-SA 4.0.
tatsoi
Today it means: Brassica rapa subsp. narinosa (syns. Brassica narinosa, Brasica rapa var. narinosa, Brassica rapa var. rosularis), an Asian variety of Brassica rapa grown for greens, lately popular in North American cuisine. Full definition →