
In a bowl, combine ground pork, cabbage, ginger, scallion, salt, pepper, soy sauce, cooking sake, and sesame oil. Mix until well combined.
Place about 1/2 teaspoon of filling in the center of each gyoza wrapper. Moisten the edges with water using your finger. Fold and pleat to seal. Repeat with the remaining wrappers.
Place the gyoza on a piece of parchment paper. Lightly brush the tops with oil, then flip and brush the other side.
Arrange the gyoza flat side up in a single layer in the air fryer basket. Air fry at 190°C (375°F) for 4 minutes (or 5 minutes if cooking from frozen).
Flip the gyoza and air fry at 190°C (375°F) for another 4 minutes (or 5 minutes if cooking from frozen), until golden and crispy.
Enjoy the gyoza hot with ponzu sauce for dipping.