Combine ground pork, shrimp, ginger, light soy sauce, Shaoxing wine, salt, and white pepper in a large bowl. Stir with a spatula until the ingredients are well combined and form a sticky paste. Thorough mixing is essential here, so your dumpling filling will stay together when you wrap dumplings. Cover with a plastic wrapper and allow to marinate in fridge until you’re ready to wrap the dumplings.