Put about half of the chopped butternut squash in a bowl with 100ml boiling water and a grinding of salt. Cover the bowl with cling film, pierce a few holes and cook in the microwave for 6-8 minutes until really soft.
Drain the butternut squash and add to a blender (I used a nutribullet) with some salt and pepper. Blitz to a purée.
Heat the oven to 240C. Finely chop half of the sage leaves and toss with the remaining chopped squash along with a drizzle of olive oil. Season with salt and pepper and roast for about 25 minutes until soft and caramelised.
Melt a tablespoon butter in a large frying pan. Add the chopped shallots and a sprinkle of salt and cook gently for 10 minutes on a low-medium heat until soft but not coloured. Add the garlic and cook for a minute more.
Add the rice to the pan and stir to coat in the onions, garlic and butter for a minute or so.
Pour in the wine, bring to a simmer and reduce by about half.
Keep the stock hot in a pan and add around a ladle of stock at a time to the risotto, stirring constantly. You might not need all of the stock, but you are aiming for cooked but not stodgy and a creamy consistency.
Stir through the puréed squash, Parmesan and Mascarpone. Taste and season with salt and about half a teaspoon of ground white pepper. Stir once more and then turn off the heat and allow to sit for five minutes before serving.
Toast around two tablespoons of pine nuts in a dry pan until just beginning to colour. Remove and put to the side for garnishing. Add a drizzle of oil to the pan and add the sage leaves. Fry on a high heat for a minute or so until crisp. Drain on kitchen paper.
Serve the risotto in bowls topped with the roasted squash cubes, the toasted pine nuts, crispy sage leaves, a sprinkle of pumpkin seeds and some dollops of mascarpone. Enjoy!