Dumplings with Ginger Dipping Sauce

Name: Dumplings with Ginger Dipping Sauce
Ingredients: 1/4 cup red-wine vinegar; 1/4 cup reduced-sodium soy sauce; 2 tablespoons sugar; 1 tablespoon Asian sesame oil; 1 scallion, thinly sliced; 2 teaspoons grated peeled ginger root; 1/4 teaspoon crushed red pepper flakes; 1/2 pound lean ground pork; 1 scallion, finely minced; 1 tablespoon reduced-sodium soy sauce; 1 teaspoon cornstarch; 1 teaspoon dry sherry; 1 teaspoon grated peeled ginger root; 1 garlic clove, minced; One 12-ounce package (about 48) wonton skins