How do you make Tesco coconut sorbet?

Put the sugar and coconut water in a saucepan and bring to a simmer, stirring until the sugar has dissolved. Put in a blender with the coconut milk, rum and a pinch of salt, then blend for 1 min. Pour into a sealable, freezer-safe container and chill for at least 2 hrs until fully cold. Transfer to the freezer and freeze for 2 hrs. Use a fork to break up any ice crystals so the mixture returns to being smooth. Freeze for another 2 hrs, then break up the crystals again. Repeat 2-3 times until the sorbet is fully set, then freeze for at least 4 hrs.