Lions Head Meatballs

Name: Lion’s Head Meatballs
Ingredients: 1 pound ground pork , 80% lean; 4 ounces water chestnuts , finely chopped (optional); 1 cup panko breadcrumbs; 1 large egg; 1 tablespoon minced fresh ginger; 1 tablespoon soy sauce; 1 tablespoon Shaoxing rice wine; 1 tablespoon sesame oil; 2 teaspoons sugar; 1 teaspoon ground white pepper; 1 teaspoon cornstarch; 1 teaspoon kosher salt; About 1 quart vegetable oil , to fry; 2 cups low-sodium chicken stock; 2 tablespoons dark soy sauce; 2 tablespoons oyster sauce; 1 tablespoon sugar; 1/2 teaspoon ground white pepper; 1/4 small green cabbage , stemmed and leaves separated; 2 teaspoons cornstarch; 2 teaspoons water