2. Cut the ribs into pieces and blanch them in boiling water.

3. Peel and cut burdock into hob blocks or slices, and soak in vinegar water to prevent discoloration;

4, add water to the casserole until it will boil, add ribs, boil over high fire, and continue to cook for one and a half hours;

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