Gyoza with Turkey and Soy Dipping Sauce

Name: Gyoza with Turkey and Soy Dipping Sauce
Ingredients: 2 cups finely chopped Napa cabbage tops; 1/4 teaspoon salt; 1/4 lb lean (at least 93%) ground turkey; 3 cloves garlic, finely chopped; 1 scallion, thinly sliced; 2 teaspoons packed brown sugar; 1 teaspoon white miso paste (shiro miso); 1/2 to 1 teaspoon chili garlic paste; 1/2 cup water; 24 circular dumpling wrappers; 2 teaspoons peanut oil; 1/4 cup water; 1/4 cup low-sodium soy sauce; 3 tablespoons rice vinegar; 2 tablespoons packed brown sugar; 1 teaspoon fish sauce; 1 teaspoon grated gingerroot; 1 scallion, sliced diagonally