On the 3rd day of the 3rd lunar month, the people in my hometown (Viet Tri city, Phu Tho province) and many other places in Vietnam make Banh Troi (floating cakes) and Banh Chay (vegetarian cakes) to worship ancestors. These two types of cakes are very simple to make. The ingredients are water-milled glutinous rice flour, green beans, granulated sugar, cubed sugar made from molasses.
First grind the glutinous rice flour and drain the water, shape the dough, then divide the dough into small parts and then put cubed sugar into it and shape it into a sphere (Banh Troi). For Banh Chay, put cooked green beans into and shape into a flattened cylinder.
Drop the cake into boiling water, wait for a few minutes for the cake cooked.
Take out the cake, drop the cake into the cool boiled water, then remove the cake to a plate if it is Banh Troi, or take it out into a bowl added a little sugar water if it is Banh Chay .
Finally sprinkle over cooked green beans or roasted sesame.
The cakes are left to cool and then brought to the altar to worship ancestors.
This custom is a little different from region to region, for example, how to make cakes. The main thing is that purity is the same.
This custom is so popular that people call the 3rd day of the 3rd lunar month as Tet 3/3 or also known as Tet Han Thuc (Tet eating cool food).