Cut russet potatoes into long, slender fries using a French mandolin. Soak cut potatoes in cold water to remove surface starch, then dry thoroughly.
Blanch the potatoes in 300°F oil until cooked through but not colored. Remove and let cool in the fridge for 3-4 hours.
Fry the blanched potatoes in 375-380°F oil until golden brown and crispy. Season with fine sea salt immediately after frying.
Serve hot with a side of ketchup, mayonnaise, and sriracha mixed for a spicy dipping sauce. Enjoy the crispy, fluffy, and salty fries!
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