For the filling, mix all ingredients until well combined. Set aside.
For the dipping sauce, mix all ingredients until well combined. Set aside.
For dumplings, place a piece of gyoza skin on palm and spoon 1 teaspoon of the filling in the center. Do not overfill. Dip your index finger into some water and moisten the outer edges of the gyoza skin. Fold the dumplings to your desired shape. Repeat till all the filling is used up.
Arrange the dumplings on a parchment paper. Steam the dumplings on high heat for 6-8 minutes or until cooked. Serve hot with dipping sauce.