The go-to Chinese filling: juicy pork mixed with the fresh onion flavor of garlic chives. Try to find a fatty blend of ground pork; it will improve the filling's flavor and juiciness. Chopped garlic chives, which have a peppery raw-garlic flavor, and fresh ginger cut through the rich meat. Make sure the dumplings are completely sealed and devoid of air bubbles to prevent any leaks during boiling. This recipe is adapted from The Dumpling Galaxy Cookbook.