Preheat oven to 200°C. Place 1 potato on a board and make thin, evenly spaced cuts at 5mm intervals, about two-thirds of the way through. (Tip: Place two wooden spoons either side of the potato while cutting the hasselbacks in order to prevent you cutting all the way through. Easy and stress free!)
Place in a bowl. Repeat with remaining potatoes. Add oil, garlic, rosemary then season with a small pinch of sea salt and pepper and toss to combine. Use a pastry brush to brush in between the hasselback cuts for maximum flavour.
Place in a roasting pan. Bake in oven, basting with the garlic oil occasionally, for 1 hour or until golden brown and crisp. Transfer to a serving bowl to serve.
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