Prepare the green plum for pickling using those harvested after Grain in Ear, known as yellow plums.After washing them clean, place them in a large jar and soak them in brine for over a month.Remove them to dry, then wash with clear water and dry again.Next, soak and marinate them in sugar, then dry — this process is repeated multiple times."ten steams and nine sun-dries, making one plum after months of effort."Finally, they become thick-fleshed, crispy, sweet and sour green plums.If stored properly, keeping away from moisture and pests, these green plums can last for several years without spoiling.