Heat remaining oil in a
large, deep pan. Tip in onion, sizzle gently for 5 minutes until softened. Add courgettes, soften for a couple of minutes, then stir in rice.
Pour in a ladleful of stock and stir until all the liquid has been absorbed. Add another ladle of stock and repeat until all the stock has been used, adding petit pois a couple of minutes before the last ladle. Simmer until rice is tender and juices creamy. Ladle into bowls, then scatter over feta and olive crumble.