Clean (peeling is optional), and cut the potatoes into strips.
Let soak in a large bowl of water for 30 minutes.
Place on paper towels and pat completely dry.
Bring oil to 275F
Fry small batches for 3-5 minutes (depending on thickness), occasionally stirring and flipping. (Slotted spoon or something similar is required). Do not let them get to golden brown. A light shade with no browning is what we want.
Transfer the potatoes to a paper towel-lined sheet. Cool in the refrigerator.
Bring oil to 350F
Fry a second time, until golden brown. Approx 3 minutes.
Blot dry with paper towel, sprinkle salt and serve.