No need.

1. Take out the flour, add a spoonful of salt to the flour, and stir evenly, as shown in the picture.

2. Then beat the egg white into the flour, as shown in the picture.

3. Then add cold water to the flour to form a dough, as shown in the picture.

4. Then knead the dough into a dough with your hands, repeatedly dip it in water and knead the dough 2-3 times, cover it with a pot lid, and let it rest for 30 minutes, as shown in the picture.

5. When the time is up, take a small piece of dough and cut it into small pieces with a knife, as shown in the picture.

6. Then use a rolling pin to roll the dough into a thin dough, as shown in the picture.