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Place the potato in a large saucepan of cold salted water. Bring to the boil and cook for 6–8 minutes or until tender. Drain and return to the saucepan.
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Add the polenta, parmesan and garlic, cover with a lid and shake to coat the potato in polenta.
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While the potato is cooking, heat the duck fat in a large non-stick frying pan over high heat. Add the potato and cook, turning occasionally, for 8–10 minutes or until golden.
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Place the rosemary and salt in a small bowl and mix to combine. Sprinkle the potato with the rosemary salt.