In a mixing bowl combine pork, bok choy, celery, and green onion; mix well. Combine 1 tablespoon soy sauce, sherry, and 1 teaspoon oil; stir in cornstarch till dissolved. Pour soy mixture over pork mixture; toss to coat. Cover and chill 30 minutes.
Cut won ton wrappers into 4-inch circles with a cookie cutter. (Keep won ton wrappers covered with a dry cloth when not working with wrappers.) Spoon about 2 teaspoons filling in center of one round. Bring up sides and seal edges with water. Transfer to a baking sheet and cover with a dry cloth. Repeat with remaining rounds and filling.
In a large skillet heat 2 tablespoons of the oil. Carefully place half the pot stickers in skillet (do not let sides of pot stickers touch). Cook over medium heat 1 minute or till bottoms are browned. Carefully add 1/2 cup water to skillet. Reduce heat; cover and simmer 10 minutes.
Uncover and cook 3-5 minutes or till water evaporates. Add more oil, if necessary. Cook, uncovered, 1 minute. Transfer pot stickers to a baking sheet. Place in a 250?F oven to keep warm. Repeat procedure with remaining pot stickers, oil, and water. Serve with Chinese mustard and soy sauce.
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