1. Prepare pickled dried prunes, prune the whole plant, remove roots, then remove old leaves and dead leaves, and directly put them in the sun, 1 to 2 days, and turn them over 1 to 3 times in the sun. Fresh vegetables will wither when dried, that is, they will turn yellow when piled together.

2. It takes about seven days for vegetables to pile yellow. In the process of Dunhuang, they should be turned once every morning. If the temperature is too high, it needs to be turned once a night. In the cold winter, it is necessary to cover the vegetables in Dunhuang with sacks and straw bags to make them turn yellow as soon as possible.

3. After the vegetables turn yellow, they should be sorted once to get rid of its bad leaves. After washing with clear water, put it in a ventilated place to dry the water on the surface. All processed vegetables should be cut into pieces with a kitchen knife. Then, put it in a jar, add a layer of edible salt to each layer of vegetables, and press heavy objects on it. Take it out and expose it to the sun, and the dried vegetables will be completely dry.