How to Make It
Dissolve yeast in lukewarm water. Add 1 cup of flour. Mix thoroughly. Cover with cloth. Let rise 1 hour, until bubbles appear.
Dissolve sugar and vegetable oil in 1/2 cup boiling water. Stir well. Cool until lukewarm. Pour into yeast mixture. Add 3 1/2 cups flour.
Knead dough on lightly floured board until smooth. Put into extra large, greased bowl in a warm place. Cover with damp cloth. Let rise until double in bulk, about 2 hours.
Heat 2 tablespoons oil in wok. Stir fry scallion and garlic 30 seconds. Add pork. Stir fry 1 minute. Add soy sauce, oyster sauce, and sugar.
Pour in dissolved cornstarch. Stir fry quickly until pork is glazed. Remove to bowl and allow to cool.
On a floured board, knead dough 1 minute and roll into one long, sausage-like roll 2 inches in diameter.
Slice the roll crosswise into 1 inch pieces.
Flatten each piece with the palm of your hand and roll with rolling pin into 3 inch rounds.
Place 2 tablespoons of filling in center of each round.
Gather dough up around the filling by pleating along the edges.
Bring the pleats up and twist securely and firmly.
Place each bun on 2 inch square of aluminum foil on steamer tray. Cover with a towel. Let rise 1 hour, until dough springs back when touched with finger. Remove towel.
Steam over briskly boiling water 10 minutes.
May be prepared in advance. May be frozen. Thaw out in plastic bag and resteam 10 minutes.