Prepare 5g of onion skin (about 1 petals) and put it in a cold water pot. Dip raw eggs in water and stick them on the eggshell with vegetable leaves (coriander or fennel). Then wrap the eggs with gauze, tie them with a rope, put them in a cold water pot, and try to completely cover the eggs with onions. After starting to cook the eggs, boil them on medium heat.