Chop the onion coarsely. Heat the oil in a pan and sauté the onion for about 2 minutes. Add the rice and fry briefly until transparent. Deglaze with the stock, bring to the boil and simmer for about 18 minutes
In the meantime cut the zucchini into cubes. Add the zucchini and peas to the rice after 15 minutes and steam
In the meantime, quarter the tomato, remove the seeds and cut into small cubes. Sprinkle over the rice just before the end of cooking time. Stir Parmasen into the rice and let it melt. Cut the chives into small rolls. Arrange rice on plates and sprinkle with chives. Serve with green salad