Heat about 2-inches of oil in a large, heavy bottomed pot over medium heat until a deep-fry thermometer reads 365 degrees F. Line a pan with paper towels.
While the oil heats slice the potatoes into shoestring fries with the thin julienne attachment of a hand-held mandolin or vegetable slicer. Swish the cut potatoes in a bowl of tepid water, and then spin them as dry as possible in a salad spinner. Spread them on towels, and blot with more towels—you want the potatoes bone dry so that they don't spatter in the hot oil.
Increase the heat to medium-high, and working in batches, carefully add the potatoes to the oil and fry until brown and crispy, about 4 minutes. Scoop the fries from the oil with a slotted spoon, and drain on the prepared pan. Repeat with the rest of the potatoes, making sure the oil returns to 365 degrees F. before adding each batch. Season with salt and serve.
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From Food Network Kitchens