1. First we do the filling. In a large bowl, add all the ingredient A and then knead them until the mixture becomes sticky like paste.
2. Place a spoonful of the mixture in the center of a gyoza wrapper. Wet the edge of wrapper with fingertip. Make pleats on one side, then fold over and seal to close. Continue with the rest of the gyoza wrappers until you used all filling.
3. Heat vegetable oil in a large frying pan over medium-high to high heat. Add several gyozas (quantity depends on your pan size). Cook them until golden brown and crispy on the bottom.
4. Add hot water (about 100ml), cover pan with the lid and let it steam over medium heat until the water evaporates. Repeat with the remaining gyoza.