Chop cabbage fine, place in colander and pour boiling water over the cabbage. Cool to touch, then squeeze cabbage well to get the water out. In a bowl mix cabbage, chopped green onions, chopped mushrooms and grated ginger. Mix ground beef, wine, soy sauce, sesame oil and black pepper together with vegetables; mix well. Place a small amount of filling (about 1 teaspoon) in center of gyoza wrapping and fold in half. Pleat edge to seal. If edges wont stick together, dampen the inside edge with a little water, then pleat. Put 2 tablespoon salad oil in heated skillet (on medium heat). Place gyozas in skillet, close together and fry until golden brown. Then, at edge of pan, pour in a little water, up to 1/4 of the depth of the pot-stickers. Cover, turn heat to low and simmer until water is gone. Serve with dipping sauce as appetizer, or with hot rice as entree. ^^^^^^^^^^^^^^^^^^^^^^^^ ^ no way Jos?! SAUCE:Mix soy sauce with chili sesame oil. Use a proportion of 10 parts soy sauce to 1 part oil; if you use a 5 to 1 proportion it may be a little hot for most people. The authentic sauce is a 2 to 1 proportion.