beans and screwpine leaves with water until soft and well done. Grind
beans until fine. Heat a pan. Add in beans and sugar. Stir constantly
while cooking. When the bean paste dries up, add in essence of vanilla.
Cool the paste, preferably in a refrigerator.
Add sugar in
warm water. Add yeast and dissolve it completely. Leave it for 10
minutes until yeast bubbles. In a mixing bowl, add sifted ingredients,
salt, yeast solution and corn oil. Knead well for 10 minutes to make a
soft dough. Spread some flour if the dough is sticky. Cover dough with a
damp tea towel and leave it for 1 1/2 hours until the dough is twice as
large. Punch the dough again and leave it for another 30 minutes.
Take out the
dough and put on a flat board, knead slowly till smooth. Divide into two
portions and roll it into an elongated shape. Cut into a 4cm piece.
Flatten each piece with a rolling pin. Fill it with a spoonful of beans
in the center. Gather up the 4 corners and tie at the top carefully.
Steam the finished bun for 12 minutes in the steamer with boiling water.