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Tip the squash into a large microwavable bowl with about 150ml water and season. Cover with cling film and microwave on high for 15 mins.
Remove from the microwave, carefully peel away the cling film and stir through the kale. Cover and continue to microwave on high for 4-5 mins until the squash is ready to mash and the kale is tender. Add the butter or olive oil and roughly mash the mixture. Season generously, stir through the nutmeg and serve.