Dry sea cucumber is a processed product of sea cucumber. Its advantage is that the nutrients are more easily absorbed by human body than fresh sea cucumber, and it is more convenient to transport. If it is sealed after drying, it can be stored for two or three years at the longest.

Before soaking dry sea cucumber, the salt on the surface of "Salt dry sea cucumber" should be washed off with purified water, while the light dry sea cucumber does not need to be cleaned. Before soaking dry sea cucumber, choose pure water to soak it.

Then, put dry sea cucumber in pure water for about two days. The soaking time can be adjusted according to the temperature and environment, and it is better to change the water every 8- 12 hours.

Cut the soaked dry sea cucumber longitudinally along the abdominal opening with scissors, remove the annular sand mouth and inner ribs on the head of the sea cucumber, and then clean the inner wall of the sea cucumber.

After that, put the sea cucumber and purified water into the pot, boil it with high fire, and then cook it with medium and small fire for about an hour. When the sea cucumber is elastic and has no hard core, you can turn off the fire. Pick up the sea cucumber and let it cool naturally.

The last and most important step is to soak the cooked sea cucumber with pure water again after the cooked sea cucumber cools naturally for about two days. It is best to change the water every 8 or 12 hours.

It should be noted that the water used for soaking sea cucumbers must be pure water, not boiled water. Then, in the process of soaking hair, sea cucumber can't get oil stains, and it is better to add ice cubes when soaking hair.