A potato chip is cut into a half-centimeter-wide square strip, which is a test of knife skill. Rinse the cut strips with clean water twice and soak them in light salt water for 20 minutes.

Put the French fries in boiling water, add a little vinegar, cook for two minutes on low heat, fish them into cold water, soak them in cold water, fish them out and put them in a leaky basket or plate to dry. The surface of the air is dry until it is completely dry, and it will soon dry in a sunny place.