The ingredients needed to make crystal cake are: 1 kilogram of crystal flour (sold in supermarkets), 3 purple potatoes (big ones), 150g of sugar and 10g of corn oil. First we start by rinsing the purple potatoes and cooking them inside the pot.

When you take it out, remove the skin of the purple potatoes, and then mash it into a purple potato puree. Then we put the mashed purple potatoes into the pan, add the right amount of sugar, wait until all the sugar is dissolved, add corn oil, stir fry with low heat, so that the purple potatoes into dry mashed, as long as the purple potatoes can be rolled into a ball does not fall apart on the fire can be turned off. Then put the fried mashed purple potatoes on a large plate.

Make sure to spread it dry! That way it is easier to cool, it must be like this to say you cool, otherwise it will crack when you put the filling. In the cooling process, we do crystal skin, the sugar into the water to boil, and then the ratio of 1 kg of flour and 400 g of water, water is not too much, not too little oh! Then pour the crystal dumpling powder into the dish, mix well together and knead into a dough, the dough must be smooth yo!

Then divide the dough into small balls, roll thin, put the purple potato filling, and then make a good package, rolled into a round shape. Finally put into the mold we prepared, press out your favorite shape, and finally wait until the water inside the steamer boils, in which the steam for half an hour can be eaten directly.