2Clean the pork liver thoroughly, removing any membranes or tough bits. Slice the pork liver into very thin, small pieces suitable for topping siu mai. In a small bowl, marinate the sliced pork liver with 5 grams of Shaoxing wine, 5 grams of light soy sauce, 5 grams of dark soy sauce, 2 grams of cornstarch, and a pinch of white pepper. Set aside.