Preparation materials: sweet potatoes: 4, flour: 700g.

1. Wash the sweet potatoes with clean water, peel and cut into pieces, then squeeze the juice from the sweet potatoes, and finally put the sweet potato juice in a container for later use.

2. Pour the flour on the table, then make a nest in the flour, add the squeezed sweet potato juice to the flour, and then knead it into a dough.

3. Use a rolling pin to roll out the kneaded dough.

4. Roll out the dough, cut it into wide noodles evenly with a knife, and stick some dry flour on it.