Scrape the pig's trotters with a knife, remove the hoof nails, wash them, put them in a boiling water pot for 30 minutes, then take them out with clean water 1.5 hours, and fix them with bamboo blocks and hemp ropes. Then put it in a boiling water pot, put it in pig's trotters and cook for about 20 minutes, then take it out and let it cool. Put the white vinegar into a pot, add white sugar and refined salt when it is slightly boiling, dissolve it, put it into a basin, filter it with a clean cloth, cool it, soak the trotters for about 6 hours, pick it up and put it in the freezer for later use. When eating, cut it into pieces and put it on a plate. Sprinkle with fried peanut oil, soy sauce and salt to serve.