Soak the shark's fins: Soak the shark's fins in boiling water first, then scrape the sand on top with a knife; at the same time, trim off the irregularities of the edges and the hairy edges. If the wings are older, it is advisable to repeatedly soak and scrape twice until the sand is clean. Clean up the shark fins into the cold water pot boil, add a little alkali, boil with the fire to cook for about an hour, with a hand pinch to move out of the pot, and then change the water rinse once or twice, remove the alkali flavor can be.