Heat 2 Tbsp vegetable oil over high heat. Place the dumplings in the pan. Lower the heat to medium high heat. Fry dumplings until golden brown on the bottom parts (more or less 3 minutes). Add 2 Tbsp hot water. Cover the pan with the lid. Wait for 1-2 minutes. Add 2 Tbsp hot water again. Cover the pan again. Add another 2 Tbsp hot water. Once again, cover the pan with the lid.