2. Add water to the flour to make a paste, then add the rice paste to the sweet potato powder, rub it hard, and finally knead it into a ball.
3. While boiling water, knead the sweet potato powder on the other side until it can drip slowly.
4. Prepare a plastic tooth cup, poke 4 holes in the bottom, the diameter is almost one finger thick, put the sweet potato ball in it, and let it slowly flow into boiling water.
5. Continue to stir in boiling water. If the powder is cooked, it will float, and the cooked powder will be fished into a clean water bucket prepared by the side and cooled. Stir slowly until all the powder comes out, and scoop it into the clear water bucket.
6. Take out all the powder in the clear water bucket, divide it into several parts and put it in the shade. The powder in the bucket is very q, so it is not fragile. You must pull hard before you can divide it.