So much like a work of art that it's almost a shame to eat, it is also tricky to make. It cannot be overcooked, or it won't be able to stand upright. There is craft in the small ladle-shaped dish that holds it up, as well. It was designed after a Han-era washing utensil called an yi.
料理難處在，火候不能過熟，否則白菜軟爛站不住，而支撐白菜的那根湯匙狀容器也功不可沒，造型取自漢代的盥洗器皿「匜」（聲同宜）。