Heat the oven to 150°C, 130 °C fan, Gas 3. Rub the butter around a 1.2 litre/ 2 pint ovenproof dish. Tip in the rice.
Stir in sugar, milk, then and vanilla essence. Sprinkle with nutmeg.
Bake for 1 hour 15 mins until the rice is tender and the top beginning to brown.
Increase the oven temperature to 190C, 170C fan, Gas 5. Sprinkle the marshmallows on top of the rice pudding and heat for 5 mins until marshmallows puff out and are light brown.
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