Place all Group A ingredients into a mixing bowl. Then use beater to beat approximately 1 minute at low speed.
Scrape down the mixture. Beat further for 1 minute at medium speed until the dough is smooth. Set aside.
Bake the salted egg yolks in oven for +/- 15 min at temperature 190°C. Leave to cool for use later.
Place all Group B ingredients into mixing bowl and mix well. Portion to 75gm per piece.
Wrap the salted egg yolk with the dou yung paste and make into round shape.
Take Group A dough and portion to 75gm and flatten the dough. Place the dou yung paste with salted egg yolk in the center and wrap it up. Shape dough into oval design.
Arrange onto baking tray and brush the surface with egg yolk.
Bake at 190°C (top) and 150°C (bottom) heat for +/- 20 minutes.