Chinese Dumplings: Boiled Pork and Cabbage Dumplings

Name: Chinese Dumplings: Boiled Pork and Cabbage Dumplings
Ingredients: 12 ounces napa cabbage leaves, roughly chopped (or regular cabbage); 1 teaspoon kosher salt (or 1/2 teaspoon table salt); 1 teaspoon grated fresh ginger (use microplane grater); 1/4 cup minced Chinese chives or green onions (white and green parts); 2/3 pounds ground pork; 1/8 teaspoon ground white pepper (or freshly ground black pepper); 1 1/2 tablespoons soy sauce; 1 tablespoon Chinese rice wine (or dry sherry); 2 teaspoons sesame oil; 1 package frozen round dumpling wrappers (gyoza/potsticker wrappers), defrosted at room temperature for 30 minutes; 1 tablespoon cornstarch + 1/2 cup water