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Cut the squash into 2 inch chunks and place in a large, preferably shallow microwave safe bowl so they lay in one layer. Add 1 tbsp of water and cover with cling.
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Microwave on high for 10-12 minutes until soft, stirring half way through to redistribute the chunks of squash so they cook evenly.
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When soft, remove the cling, drain away excess liquid and mash with a fork before putting to one side.
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Place a saucepan on medium heat and melt the butter with a drizzle of oil to prevent it burning. Add the onions and celery, cooking until soft and translucent, not browned.
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Add the garlic and sage and cook for 1 minute to release their aroma before adding in the mashed squash.
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Give it a good beating with your spoon or spatula and then blitz with an immersion blender to purée, pouring in as much stock as you want. I like this quite thick and with a bit of texture to it.
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Leave on a low heat as you bring a vast pot of water to the boil, drop in your gnocchi and cook for barely 2 minutes until they float. Drain well and add to the sauce before serving.