Combine the flour, salt, hot water and shortening in a bowl and incorporate into a smooth dough. Allow the dough to rest for 20 minutes, covered.
Combine the filling ingredients. Combine the dipping sauce ingredients.
Roll the dough out about 1/8 thick. Use a biscuit cutter or a glass to cut out 3 inch circles. Brush a little water over the circles and place about 2 teaspoons of filling in center. Fold the circles in half and press to seal, making sure to squeeze out any air. Stand the dumplings up on the folded side and press slightly so that they stand up nicely.
To cook, bring a pot of salted water to boil, and boil the dumplings until cooked through, about 5 minutes. Drain well. The dumplings may be frozen at this point for future use; this recipe makes about 8 dozen. Heat a skillet with about 2 tablespoons oil and fry the dumplings on one side only, until nicely browned. Drain on paper towels.