After we control the oil of pigskin to dry, we should soak the fried pigskin in clear water for a period of time, which will also make the pigskin more elastic and completely expand. After soaking for a period of time, it can be taken out and drained again. Soak pigskin for half a day, the effect is good, because pigskin was air-dried before, so the soaking time will be longer. The next step is to cut the soaked pigskin into strips, then cut the ginger into pieces, and cut the pepper, onion and garlic into pieces, and then keep them for later use. Put cooking oil in a hot pan, add chopped garlic and ginger, stir fry, add a spoonful of bean paste, stir fry red oil, then add pigskin and stir fry, and finally add pepper and onion. Stir-fry the pepper until it changes color, then add some salt and some aged oyster sauce, stir well, then turn off the heat and plate.