2. Cut the ribs into pieces and put them in clear water. After the water is boiled, skim off the floating foam and take out the ribs.

3. When the water in the casserole is about to boil, add the ribs, boil over high fire, and continue to cook over low heat for one and a half hours.

4. Peel the burdock, cut it into hob blocks or slices, and soak it in vinegar water to prevent discoloration.

5. Pour the burdock into the casserole, continue to cook for half an hour, and add a little salt to taste.