1. Soak pig's trotters in warm water, scrape off the oil on the surface with a knife, and chop. Wash onion, ginger and garlic separately, cut onion into sections and slice ginger.

2. Add water to the pot, boil the trotters, blanch them to remove oil stains, remove them and wash them (if they are cooked, you can omit the above steps).

3. Add clear oil to the pot, first add garlic and stir-fry until yellow, then add onion, ginger and star anise and stir-fry until fragrant, and finally add pig's trotters, cooking wine, soy sauce and rock sugar and stir-fry until pig's trotters are sauce red.

4. Add the broth, salt and pepper, bring to a boil over high heat, turn to low heat for one and a half hours until the trotters are soft and rotten, and add chicken essence to taste.