Cook the rice in a saucepan of lightly salted boiling water for 10-12 minutes, until tender.
Meanwhile, heat the vegetable oil in a large frying pan or wok and gently fry the mushrooms, onion, garlic, pepper and green beans for 3-4 minutes, until softened. Add the curry powder and cumin seeds and stir for another minute, then add the frozen peas and cook for 1-2 minutes, stirring often.
Drain the rice thoroughly and add it to the frying pan or wok. Season and stir together. Pile onto warm serving plates and serve, sprinkled with chopped coriander.