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Heat oven to 200C/180C fan/gas 6. Put the butternut squash and garlic cloves in a roasting tin, season well and add 100ml water. Cover the tin with foil and bake for 45 mins, until the squash is really tender. Leave to cool.
Tip the squash into a food processor with any juices from the tin. Add the garlic cloves, squeezed out of their skins. Add the remaining ingredients, season with salt and blend to a paste.
Scrape the hummus into a bowl. Drizzle with extra harissa before serving.