Place fries into a 350°F fryer. Cook until golden brown and crispy.
Drain well. Transfer immediately to a stainless-steel bowl.
Season with S&P and rosemary. Toss fries to ensure even coverage. Taste and adjust seasoning as needed.
Stack fries on plate, as shown in the photo.
Serve with a ramekin of ketchup next to the fries, as shown in the photo.
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