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Put the beetroot into a steamer over simmering water and cook for around 15 mins, add the apple and cook for a further 8 mins until both are tender.
Blitz to a purée in a food processor. Add a splash of milk (or water from the saucepan), if necessary, 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.