You can eat it. The method is: 1. Put the potatoes in the refrigerator and freeze them. Be sure to freeze them hard. 2. Thaw the frozen potatoes in cold water until the ice is completely melted. At this time, the potatoes become soft and there is a lot of water in them. 3. Put the thawed potatoes on the chopping board (you can put the chopping board on the basin to prevent water from flowing everywhere), and then squeeze them with a plate to squeeze out the water. Note that this step is crucial. Whether they are good or not depends on how much water they get. Try to squeeze out the water as hard as possible. The pressed potatoes are flat.