Pork Potstickers

Name: Pork Potstickers
Ingredients: 1 pound ground pork; 1 large egg, lightly beaten; 1 cup sliced scallions; ¼ cup Shaoxing rice wine (see Tip); ¼ cup reduced-sodium soy sauce; 2 tablespoons mushroom dark soy sauce (see Tip); 2 tablespoons minced fresh ginger; 1 tablespoon sesame oil; 1 tablespoon sugar; 1 tablespoon cornstarch, plus more for dusting; 1 teaspoon ground white pepper; ¼ teaspoon salt; 2 cups finely chopped napa cabbage; 80 round dumpling wrappers; 7 tablespoons canola oil, divided; 3 ½ cups warm water, divided