Peel potatoes, dip them in the sauce, wash them, replace them with chunks, steam them in a cage over high fire, take them out while they are hot, expose them to the sun with a knife, scrape them into a big bowl, add 1 egg, onion and ginger juice, salt, monosodium glutamate and raw flour, mix well and divide them into 5 parts; Spare. Remove roots, stems and yellow leaves, wash and drain. Take a small bowl, knock in the eggs, air dry, add proper amount of cornflour and mix well: take a portion of mashed potatoes, put it on the chopping board, flatten it with a knife, trim the edges, smear the egg liquid, remove the crumbs, compact it, turn it over with a knife, smear the egg liquid, sprinkle the crumbs, compact it, and then arrange the prepared potatoes on a breaded plate.