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Put the carrots and swede into a steamer over simmering water and cook for about 20 mins until tender.
Blitz to a purée in a food processor with a splash of milk (or water from the saucepan) to create a smooth texture. You may need to scrape the sides of the bowl a few times while blitzing to get a smooth consistency throughout.
Serve one portion and divide the rest between small containers or ice cube trays and freeze.