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1. Put flour in a bowl. Make a well in the middle and pour in boiling water and oil.
2. Mix with a fork until flour is moistened.
3. Transfer to a floured surface and knead for 7-10 minutes or until the dough is smooth.
4. Allow to rest for 30 minutes.
5. Roll into logs with 1-inch diameter. Cut into ¾ inch pieces.
6. Flatten and roll out into a circle about 3 inches diameter.
7. Make sure to cover the dough with a towel at all times to prevent it from drying.

Chocolate filling

1. Simmer milk in a heavy bottom saucepot.
2. Fold in the hot milk in a bowl with the chocolates. Stir until well until smooth and well combined.
3. Place inside the chiller to set completely.

Assembly and cooking

1. Fill a piece of rolled dough with a tablespoon of chocolate filling.
2. Lift the edges and seal in a circular motion with pleats. After sealing, pinch the top part to seal in all the pleats.
3. Repeat with the rest of the ingredients and place on a pan.
4. Store in the freezer for at least 30 minutes before steaming to make it firm.
5. Steam for 10 to 12 minutes or until cooked. Serve hot.