Put the rice in a bowl and wash in several changes of water. Drain. Add 1.25 litres/2 pints of water and leave to soak for 30 minutes. Drain and leave in a sieve for 20–30 minutes.
Cut the potato and carrot into 5mm/¼ inch dice. Trim the green beans and cut across at 5mm/¼ inch intervals.
Heat the oil in a heavy pot over a medium heat. When hot, put i