Using an apple slicer for cutting potatoes
You can use an apple slicer for cutting potatoes too. When I need to fry sliced potatoes, I boil them in the water first for 10-15 min, slice them with the apple cutter, and then bake the potatoes in the oven or deep fry after.
If you are cutting the raw potatoes with an apple slicer, cut the potato with a knife in half crosswise first for stability.
