In a mixing bowl, combine the flour and salt. Gradually add hot water while stirring until a dough forms.

Knead the dough on a floured surface for about 5 minutes until smooth. Cover with a damp cloth and let it rest for 20 minutes.

In another bowl, mix together the ground pork, chopped napa cabbage, soy sauce, sesame oil, ginger, garlic, green onions, and black pepper until well combined.

Divide the dough into small pieces and roll each piece into a thin circle.

Place a spoonful of filling in the center of each circle. Fold the dough over and pinch the edges to seal.

To steam, place dumplings in a steamer basket over boiling water and steam for about 15 minutes.

To pan-fry, heat a little oil in a pan, add dumplings, and fry until the bottoms are golden. Add water to the pan, cover, and steam until cooked through.