1. Wash the pig's trotters after buying them, soak them in water for a few hours, change the water several times in between, put cold water into the pot, add a spoonful of cooking wine, cover, bring to a boil over high heat, blanch and drain. Take it out and put it into cold water to wash away the dirt and impurities.

2. Put the pig's trotters back into the pot. The water should cover the pig's trotters. Add star anise, cinnamon bark, bay leaves, grass fruit, a little rock sugar, two or three slices of ginger and green onions, and add Two spoons of light soy sauce, one spoon of dark soy sauce, stir evenly, cover the lid, turn on and off the high heat, keep it boiling slightly, cook for 15 minutes, turn off the heat and simmer for 30 minutes, cook for another 15 minutes, simmer for 30 minutes, repeat this three times. Overcooked.

2. Take out the pig's trotters and put them in a crisper. Filter the original soup and pour it into the crisper. Let it cool, cover it, and put it in the refrigerator for eight hours to completely solidify. If you want to eat the pig's trotters, You can take it out to remove the oil on the surface.