In a large mixing bowl, combine the flour and warm water until a dough forms. Knead the dough for 5-10 minutes until it becomes smooth and elastic. Cover the dough with a damp towel and let it rest for 30 minutes.
In a separate mixing bowl, combine the ground pork, shredded cabbage, soy sauce, sesame oil, garlic, ginger, salt, and black pepper. Mix well until all ingredients are evenly distributed.
On a floured surface, roll the dough into a long cylinder shape, then cut it into small pieces. Roll each piece into a small ball, then use a rolling pin to flatten it into a circle about 3 inches in diameter.
Place a small spoonful of filling in the center of each wrapper. Fold the wrapper in half and pinch the edges together to seal the filling inside. Repeat until all of the filling has been used.
Place the dumplings in a bamboo steamer lined with parchment paper or cabbage leaves. Steam the dumplings for 10-12 minutes over high heat until they are cooked through.
Serve the dumplings hot with a dipping sauce made from soy sauce, vinegar, and chili oil.
