Fry the minced meat and the finely chopped onion in hot oil. Then add the rice and fry with it. Then add the stock and simmer for about 20-25 minutes with the pan closed. Season to taste with salt and pepper. Add the peas and corn and stir. Also with the pan closed, simmer on low heat for 10 minutes until the liquid has boiled away. Season again and season again if necessary. Serve hot.