Chinese Stewed Pork Meatballs

Name: Chinese Stewed Pork Meatballs
Cuisine: Asian, Chinese
Ingredients: 500g ground pork (preferably with some fat content); 1/4 cup water chestnuts, finely chopped; 3 scallions, finely chopped; 1-inch piece of ginger, minced; 1 large egg; 2 tbsp light soy sauce; 1 tbsp dark soy sauce; 1 tbsp Shaoxing wine (or dry sherry); 1 tsp sesame oil; 2 tsp corn starch; Salt and white pepper to taste; 1/2 head napa cabbage (or bok choy), cut into large pieces; 3 cups chicken broth (or water); 2 tbsp vegetable oil (for searing)