Combine flour, salt, hot water and oil in a medium bowl; make a smooth dough. Allow the dough to rest for 20 minutes, covered. Combine the dipping sauce ingredients in a small bowl; set aside. Combine the filling ingredients. Roll the dough out about 1/8" thick. Use a biscuit cutter or a glass to cut out 3" circles. Brush a little water around the edges of the circles. Place about 2 tsp. filling in center. Fold the circles in half and press to seal, making sure to squeeze out any air. 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 to use later.) This about 8 dozen or so. If not frozen, heat a skillet or wok until hot, add about 2 T. oil and heat. Add dumplings and fry them until nicely browned on one side. Drain on paper towels. Serve with the dipping sauce.