Cut the celery cabbage across into thin strips. Mix with 2 teaspoons salt and set aside for 5 minutes. Squeeze out the excess moisture.
In a large bowl, mix the celery cabbage, pork, green onions, wine, cornstarch, the remaining 1 teaspoon salt, 1 teaspoon sesame oil, and the pepper.
In a bowl, mix the flour and 1 cup boiling water until a soft dough forms. Knead the dough on a lightly floured surface about 5 minutes, or until smooth.
Divide the dough in half. Shape each half into a roll 12 inches long and cut each roll into ½-inch slices.
Roll 1 slice of dough into a 3-inch circle and place 1 tablespoon pork mixture in the center of the circle. Lift up the edges of the circle and pinch 5 pleats up to create a pouch to encase the mixture. Pinch the top together. Repeat with the remaining slices of dough and filling.
Heat a wok or nonstick skillet until very hot. Add 1 tablespoon vegetable oil, tilting the wok to coat the sides. If using a nonstick skillet, add ½ tablespoon vegetable oil. Place 12 dumplings in a single layer in the wok and fry 2 minutes, or until the bottoms are golden brown.
Add ½ cup water. Cover and cook 6 to 7 minutes, or until the water is absorbed. Repeat with the remaining dumplings.
To make a dipping sauce, in a small bowl, mix the soy sauce with 1 teaspoon sesame oil. Serve with the dumplings.