Prepare a number of purple potatoes in advance, peel, rinse, cut into pieces and put them on a plate. Boil cold water, steam 15 minutes, and cook. Pour the steamed purple potato into a large pot and grind it into fine purple potato paste with a rolling pin, and let it cool at room temperature.
Divide the cooled purple potato paste into two parts, and add a proper amount of rice flour to one part. Rice noodles are usually sold in shopping malls. If not, you can crush the rice with a wall breaker and then sieve it. About 350 grams of purple potato paste was used here, and 200 grams of rice flour was added. Stir well and rub with your hands. Finally, you can rub it into a ball by hand, which feels very loose, and then reserve it with dice.
In addition, add white sugar, condensed milk and milk to half of the purple potato paste according to your own taste and mix well for later use. Prepare the bottom of a formwork, spread a piece of oil-absorbing paper which is convenient for demoulding, first spread a layer of prepared purple potato rice paste, smooth the surface but don't press lightly, then put the mixed purple potato rice paste in the middle, finally spread the remaining purple potato rice paste, steam the cover with a cage cloth to prevent the surface from becoming rough and hard, and steam the water for 30 minutes after boiling. When it is long enough, it can be taken down to dry for a while, turned over and taken out of the mold, and everyone's purple potato rice cake is ready.
The prepared purple sweet potato rice cake can be cut into small pieces to enjoy. It is big and soft, and its taste is tender and chewy. Purple sweet potato is full of fragrance, accompanied by rich milk fragrance. As soon as it was cooked, people scrambled to eat it.
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