Cut potatoes. Using a sharp knife or French fry cutter, cut the potatoes into ¼ square strips.
Ice bath. Place them in a bowl of ice water. Place in the refrigerator and allow to chill for at least 2 hours, up to 12 hours.
Prep oil. Set up deep fryer according to manufacture's instructions and fill with peanut oil. Preheat the deep fryer to 325℉.
First fry. Drain the water from the potatoes and pat them as dry as possible. They will be very cold, maybe even frozen. Place the potatoes in the basket. It's okay if they are crowded for the first fry. Submerge into the oil and deep fry for about 5-7 minutes until they are softened and slightly darker, but still pale. Place on paper-towel-lined baking sheet to drain.
Second fry. Increase heat in deep fryer to 375℉. Fry the French fries a second time, this time in smaller batches so that they float freely in the oil. Fry for only 2-4 minutes, or until they have reached the desired level of brownness and crispness. Drain on paper-towel-lined baking sheets, and salt immediately. Serve as soon as possible.
Notes
Add Old Bay, white pepper, Cajun seasoning, Italian seasoning, or anything else you'd like to try as soon as you remove the fries from the deep fryer.French fries do not keep well, but leftovers are okay heated up in an air fryer..