In a large bowl, combine pork, cabbage, carrot, garlic, green onions, soy sauce, hoisin sauce, ginger, sesame oil and white pepper. To assemble, spoon 1 tablespoon of the mixture into the center of the wrapper. Using your finger, moisten the edges with water. Fold dough over filling to create a half-moon shape, pinching the edges to seal. Bring pot of salted water to boil and cook dumplings until they float. Serve immediately with dipping sauce.