The method of soaking dried shark's fin is as follows:
1, take a clean oil-free pot, put shark's fin and clear water (water does not pass shark's fin), soak for 24 hours, then take it out and drain. Water should be changed twice during soaking to remove impurities and dirt from shark fins.
2. Take another clean pot, add shark's fin and enough water. When the fire boils, turn to low heat, cover it and cook for 4 hours, then turn off the fire and cool.
3. Take out the cooled shark fin, soak it with clear water to remove the colloid and sediment in the shark fin, and rinse it again.
4. Add 2 liters of water, shark's fin, onion 10g, ginger 10g to the pot, cover it with low heat and cook for 5 hours, then turn off the fire.
5. Take out the shark fin and clean it again, remove all sundries outside the fin needle and drain the water. At this time, the shark fin has become filiform.
6. Spread a drawer cloth or lotus leaf in the basin, then put shark's fin on the drawer cloth, and put the basin in a steamer. Steam on medium heat until the fin needle can be broken with nails.
7. Take another pot, add shark's fin and enough water, turn to low heat and continue cooking 1 hour after the fire boils, turn off the fire, cover the pot and let it cool.
8. When the time is up to 1 hour, turn off the fire and cool, take out the shark fin, soak it in clean water and wash it again, and then take out the shark fin, as shown in the following figure.