This kind of general vegetable market or supermarket will sell it.

Practice Add 3 grams of salt to the flour and stir, then slowly add boiling water and stir until the dough is mixed. At this time, the dough is not very smooth. Wrap it in plastic wrap and relax for five minutes, then knead it until it is smooth. Knead the dough into long strips and divide it into 12 dough pieces, and each dough is rounded. Find a bigger disc and brush it with oil. Put the rounded 12 dough on a plate, and brush a layer of oil on the dough surface. Cover with plastic wrap and relax for more than 40 minutes. When we relaxed the dough, we began to make braised pork. First cut the pork belly into small pieces. Put the pot in cold water and add the chopped pork belly, onion and ginger slices. After boiling, skim off the floating foam, remove the pork belly and rinse it with water.