2. Wash the trotters, chop off the tips of the paws and cut them in half. Cook them thoroughly with water and put them in cold water. Mash ginger and onion for later use.
3. Heat a little sesame oil with a frying spoon, add rock sugar and fry until purple, and then adjust the soup to light red.
4. Add trotters, cooking wine, onion, ginger, salt and pepper. After the soup is boiled, skim off the froth. After the pig's trotters are colored on a big fire, move them to a small fire for stewing and collect concentrated juice.