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Heat oven to 180C/160C fan/ gas 4. Chop up the pumpkin into 1.5cm cubes. Put it on a baking tray, drizzle over some oil, then roast for 30 mins.
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Heat the olive oil and 1 tbsp of butter in a large frying pan over a medium heat. Add the leeks and cook for about five minutes, or until soft. Add the garlic and cook for two more minutes. Add the bacon and fry until it starts to get crispy.
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Add the rice and cook, stirring, for a few minutes until it is slightly toasted. Add about a quarter (235ml) of stock and cook, stirring, until it has been absorbed into the rice. Repeat this process with the remaining stock and the white wine until it reaches the right consistency - approx 15 minutes. The rice should remain on the al dente side (slightly hard when bitten) because the rice continues to cook when removed from the heat.
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When the rice is finished, stir in the roasted pumpkin, parmigiano reggiano cheese, the remaining butter, black pepper and cook for a further 1-2 minutes.
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Garnish with chopped, roasted walnuts (optional). Serve immediately.