The preparation materials are 2000 grams of long beans and water 1000 ml.

The specific steps are as follows:

1, wash the beans with clear water, boil the water in the pot, pour the beans into the pot and cook for 5 minutes.

2. After the beans are cooked, fish them up and put them in clear water.

3. Then remove it from the clear water and drain it.

4. Hang the beans with a hanger and expose them to the sun for 2 days.

5、? After 2 days of exposure, you can wrap the dried beans with thread.