Bring the milk to the boil along with all the other ingredients up to and including the salt. Reduce the heat, simmer for approx. 25 mins. over a low heat, stirring occasionally to form a thick, creamy rice pudding, allow to cool slightly. Beat the cream until almost stiff, mix in with the rice pudding, serve in bowls.
Pour the water into a pan along with all the other ingredients up to and including the cinnamon, bring to the boil, simmer for approx. 5 mins. Add the rhubarb, simmer for a further 3 mins. Allow to cool slightly, spoon on top of the rice pudding.