scallion

蔥 is composed of the radical 艸 (grass) and 悤 (haste, intelligent). 艸 is a pictograph of grass, referring to vegetables, while 悤 is formed from 囪 (chimney, window) and 心 (heart), implying the center of something which is hollow like a window. Thus, 蔥 represents a vegetable which is hollow in its leaves or stem, resembling a window, such as scallion.