I used to love what my mother did. Now I am married and I am doing it myself. It is very simple.
Cut the pig's heart, wash the blood clot inside, soak it in water for 20-30 minutes.
Pour off the blood, and put it with the cold water, hang it
After the water is opened, remove the pig's heart, wash the floating foam, and cut the strip with a knife.
Put up the pot again, put in the pig heart, ginger, old wine, soy sauce, salt, water, not too much, no more than a little more
Cover the lid, turn the water on and simmer for 20 minutes, then you can cook it.