1, relatively large thick fish maw, cut into small pieces before preparing water, and then soak the chopped fish maw in cold water for 3 ~ 4 hours. After soaking, wash the fish belly, put it in a pot and add clean cold water, turn off the fire after boiling the water in the pot, and let the fish belly soak in hot water for 2 ~ 3 hours.

2. If it is not a thick dried fish belly, it can be used completely after the above steps, but it will not work if it is too thick. We can wait until the hot water cools down and boil it again. We can boil it three times a day and soak it completely in two days at most, depending on the thickness of the fish belly.