Parboiling releases the starch and helps the potatoes cook more evenly when fried. Be sure to cut your potatoes into evenly-sized pieces to ensure they cook at the same speed.
Start the potatoes off in a mixture of cold water, salt, and a dash of vinegar. Set the flame to high and cook for about five minutes after the water reaches a rolling boil.
Once partially cooked, remove them and leave them in the strainer to cool and release excess moisture from the parboil. Then, fry them in a hot, oiled skillet until golden brown.
The trick to crispy fries in a deep frier relies on the oil temperature and double-frying. The first round of frying partially cooks them before crisping them in the second fry.
In a deep fryer or pot, heat your oil to 330 degrees Fahrenheit, add the fries, and cook them for two minutes. Remove them from the oil, and place them on a wire rack to cool.
Increase the temperature of the frying oil to 385 degrees Fahrenheit. Add the fries back in, cook them until they float to the top, then remove them, season, and serve.