Start by making sure you have space for a metal pan in the freezer.
Place the rhubarb, lemon juice and sugar in a pot and cook until soft. Let cool, then chill for about 2 hours or until cold.
Put the rhubarb compote in a blender or use an immersion blender, and process to a purée.
Mix the rhubarb purée and the water then pour into a metal pan and freeze.
Begin setting a timer for 45 minutes intervals. When the timer sounds, remove the pan from the freezer and stir well with a fork. The first time, it will seem like it's not working, but it's okay. Put the pan back into the freezer. Continue this for at least 4 or 5 times or until the granita is ready. You will know when you have ice crystals instead of a solid mass.
Transfer to clear serving glasses or dessert bowls, if serving immediately. If not, move the granita to a sealed container and keep frozen.
If you are serving it with cream, top the rhubarb ice with freshly whipped, unsweetened cream. Serve with a Sicilian brioche for an authentic experience.
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