This question has options. How would someone go about accomplishing this goal?
To fry potatoes a second time for a crispy exterior,

I. gently place hot fried potato slices into the 400F heated oil for 2 to 3 minutes, making sure the slices don't stick together..
II. gently place room temperature fried potato slices into the 400F heated oil for 2 to 3 minutes, making sure the slices don't stick together..
II.