1. Sweet potato powder mixed with water, the ratio is one to three. Just use cold water.
2. Then put it in the pot and cook it, and it will become paste in two or three minutes.
3. Continue to cook on low heat and keep stirring. To all transparent colors. White means undercooked.
4. put it in a fresh-keeping box, preferably square, which is conducive to cutting blocks. Cool slightly and freeze in the refrigerator for half an hour. Sprinkle some water and cut into pieces.