Combine first 9 ingredients in a medium bowl; stir well, and set aside.
Working with 1 won ton wrapper at a time (cover the remaining wrappers to keep them from drying out), spoon about 1 tablespoon pork mixture into center of each wrapper. Moisten edges of dough with water, and bring 2 opposite corners to center, pinching points to seal. Bring remaining 2 corners to center, pinching points to seal. Pinch 4 edges together to seal. Place dumplings on a large baking sheet sprinkled with 2 teaspoons cornstarch, and cover loosely with a towel to keep from drying out.
Line a bamboo steamer with steamed cabbage leaves. Place dumplings 1/2 inch apart in steamer; cover with steamer lid. Add water to a large skillet to a depth of 1 inch; bring to a boil. Place steamer in skillet; steam dumplings for 10 minutes. Remove dumplings from steamer.