Begin by adding the long grain rice and the water to a pot and bring to a boil. Once it reaches a boil, turn the heat down to low and simmer until the liquid is almost absorbed.
Once the water is nearly gone, mix together the cream and milk in a large jug and add 750 mls of the mixture to the pot along with the rice. Next, add the sugar and stir the mixture.
Allow the rice, cream, milk and sugar to simmer for 25-35 minutes, stirring frequently until the mixture is very thick.
Once thickened, remove from the heat and whisk in the egg, the remaining 150 mls of the cream and milk mixture. Stir.
Finally, add the vanilla, nutmeg and white chocolate and stir until the chocolate melts.
Serve the pudding warm with an extra sprinkle of nutmeg on top!