Simmer the plums and the sugar till it is almost reduced. Set aside to cool. Then blend all the other ingredients.
Transfer to an air-tight container and freeze for 1-2 hours. Then mix with a spoon and freeze again for another 1-2 hours.
Mix again and do this 2-3 times. Finally freeze for a minimum of 7-8 hours or overnight. Serve in individual bowls and enjoy this delectable fruity ice cream chilled.
