- Preheat the oven to 200°C.
- Halve the red kuri squash and remove the seeds. Place cut-side down on a baking tray alongside the whole garlic bulb and roast for 40 minutes, or until soft and caramelised.
- Once cooled slightly, scoop the squash flesh into a blender. Squeeze in the roasted garlic and add 50g of the chestnuts. Blend until smooth, adding a few tablespoons of water as needed to create a silky, pourable sauce.
- Cook the pasta according to the packet instructions. Reserve a splash of pasta water before draining.
- Meanwhile, melt the butter in a large frying pan over medium heat. Add half of the sage and cook until the butter is lightly browned and fragrant.
- Stir the squash and chestnut sauce into the pan, then add the mascarpone and a pinch of salt. Mix until smooth and warmed through.
- Add the cooked pasta along with a splash of the reserved pasta water. Toss well to coat, then stir through the Parmesan.
- To make the crumb, heat the extra virgin olive oil in a small frying pan. Roughly chop the remaining chestnuts and add to the pan with the remaining sage leaves. Cook until golden and crisp.
- Divide the pasta between bowls and scatter over the crispy chestnut and sage crumb before serving.
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