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Preheat the oven to 180°C.
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Line a baking tray with baking paper and place the sweet potato onto the tray, drizzle with 2 tbsp olive oil then sprinkle with nutmeg and sage leaves.
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Place into the oven and cook for 15 minutes or until soft and golden.
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Cook the pasta according to the packet directions, drain and set aside.
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Heat the remaining 2 tbsp olive oil in a frypan and gently sauté the garlic and leek until they soften.
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Add the cooked sweet potato and sage to the garlic and leek; season to taste.
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Toss through the cooked pasta and serve with grated parmesan.