Wash dry mushrooms and soak them in warm water mixed with 1 tsp. sugar.
When they are soft, chop them finely.
Separate all the leaves of nappa cabbage and wash well.
Cook cabbage either by boiling or a microwave oven until tender. Drain
and chop finely.
In a large bowl, put all the ingredients (except wrappers) together
and mix well.
Put about 1 table spoonful meat mixture in the middle of the wrapper.
Fold in half. Put pleats.
Heat 3 tbsp. vegetable oil in a shallow non-stick frying pan at medium
heat. Line the gyoza (pot stickers) and cook them until the bottom of
the gyoza are slightly brown.
Add boiling water to cover the whole pan up to 1/4 inch, put a lid
and let it steam for about 7 min. or until the meat is completely cooked.
Remove the lid and let the remaining water to evaporate. If there
is too much liquid, drain. Cook a few minutes longer until the bottom
of the gyoza is crispy brown.
Serve hot with vinegar dip ( vinegar:soy sauce=50:50). If you have
extra meat mixture , you can freeze it.