In a large mixing bowl, place the ground meat and add in the salt, wine, dark soy sauce, beaten egg and corn starch. Using your clean hand, knead the meat until everything is well mixed. Cover with plastic wrap and eave in the refrigerator for about 15 minutes
Prepare the braising liquid in a small pot by bringing it to a boil and the sugar dissoves completely. Set aside. When the meat is ready, wet your clean hands with water and shape the meat into about 6-8 large meatballs. Heat 2 Tbsp of oil in a large heavy-bottom cast-iron pot if you have one and brown the meatballs until they are brown on all sides and remove and set aside. You'll have some bits and pieces from browning the meat, leave them in. Add in the spring onion and ginger and saute until fragrant. Place the meatballs back into the pot and pour in the braising liquid you prepared earlier. Bring the liquid to a boil and then lower the heat and cover the pot with a lid to let it simmer for about 1 hour
After 30 minutes of cooking, uncover the lid and add in the napa cabbage on top of the meat balls and cover the lid back and let it cook for another 30 minutes. Serve warm or hot with rice as part of multi-course meal