In a large bowl, stir together the ground pork, shredded cabbage, rice vinegar, soy sauce, garlic, chopped green onion, sesame oil, salt, and pepper until well combined.
In a separate bowl, scramble an egg.
Place the wonton wrapper on a dry, flat surface.
Add one large spoonful of filling to the middle of the wonton wrapper. Lightly brush the outer edge of the wonton wrapper with the beaten egg mixture.
Pinch together the edges of the wrapper to close the potsticker.
Heat some oil in a nonstick skillet. Once it is hot, place the potstickers in, ensuring they do not touch.
Cook until the exterior of the potsticker is slightly browned on both sides. About 3 minutes on each side.
Once they have a browned exterior, add a cup of water to the pan and cover it.
Allow the potstickers to steam for 4 minutes until they are tender and fully cooked.
Remove them from the pan and serve with your favorite sauce or main course.