How to make shark fin delicious?

Soak shark's fin in clear water for about five hours, boil the water by half in a rice cooker, put shark's fin in the pot together with a lemon or an orange to make it smell, turn off the fire after boiling for about 20 minutes, turn on the heat preservation system, soak shark's fin in the rice cooker for about three hours, and then soak it in clear water for two hours. If the shark fin is thin, the water outlet time can be shortened to half an hour accordingly.

Method 2 for soaking shark fin:

Soak shark's fin in clear water for about five hours, put it in a water pot for half an hour, put it in the pot to make it smell, cook for about twenty minutes, then turn off the fire, don't lift the lid, let the shark's fin freeze in the pot, then soak it in clear water for three hours, and repeat the above process once or twice until the shark's fin is enough, then soak it in clear water for three hours, that is to say, it can be used (even the last pot).