In a large bowl, combine ground pork, chopped cabbage, soy sauce, sesame oil, garlic, and ginger. Mix well until all ingredients are evenly incorporated.
Place about 1 tablespoon of filling in the center of each potsticker wrapper. Moisten the edges with water, then fold and press firmly to seal the edges.
Heat vegetable oil in a large skillet over medium-high heat. Add potstickers in a single layer and cook until bottoms are golden brown, about 2-3 minutes.
Pour water into the skillet, cover immediately, and steam potstickers until the water evaporates and filling is cooked through, about 8-10 minutes.
Remove the lid and cook for another 1-2 minutes to crisp up the bottoms again before serving hot.
Notes
Serve with soy sauce or chili oil for dipping. Leftover potstickers can be refrigerated and reheated by pan-frying or steaming.