Cut the fruit into chunks and add to a sauce pan with the lemonade and sugar. Cook over medium heat until the rhubarb is softened. Remove from the heat and add the vanilla extract. Transfer to a liquidiser or high-powered blender and blend on high until completely smooth - increase the speed slowly as the mixture is hot. If your machine isn't so great and there are still small lumps after a long blend, strain the mixture through a fine mesh sieve. Can be served warm or chilled.

Cut the fruit into chunks and add to the Thermomix with the lemonade and sugar. Cook 8 minutes/speed spoon/90c, or until the rhubarb is softened. Turn off the machine and add the vanilla extract. Blend 30 seconds/speed 10 - increase the speed slowly as the mixture is hot. Can be served warm or chilled.