Toast the rice in a pan for approx. 2 mins. Pour in the milk and cream, bring to the boil, simmer for approx. 10 mins., remove the pan from the heat. Add the sugar and lemongrass, cover with cling film and leave to infuse for approx. 15 mins. Puree the mixture, leave to cool in a wide stainless steel bowl. Cover and freeze the mixture for approx. 4 hrs., stirring 3 times.
Mix the mango, passion fruit, mint and icing sugar. Serve with the rice ice cream.