Arrange all the fillings in the order they will be placed: mung beans, pork belly, salted egg yolk, mushroom, chestnut, dried shrimps, fried shallots, shallot oil.
Fold 2-3 bamboo leaves into a cone shape, smooth side facing inwards. Make sure the corners overlap to prevent rice from falling out.
Add about 1 tablespoon of rice and press tightly. Then add mung beans, one piece of meat, half of a salted egg yolk, one piece of mushroom, one chestnut, dried shrimps, fried shallots and some shallot oil. Add more mung beans and top with more rice.
Press the filling until it is compact. Gently press the sides with your thumb and index finger while using the other hand to fold the bamboo leaves. You will see a tail. Fold the tail towards you to form a pyramid shape. If the bamboo leaves are not long enough, add an extra leaf if needed. Secure tightly with grass water string or kitchen string.