Heat the oil in a large saucepan or frying pan over a medium heat and fry the onion for 4-6 mins until softened but not golden. Add the garlic and chilli, and cook for 1 min more to soften. Stir in the cherry tomatoes and cook for 5 mins until starting to break down.

Stir in the orzo, then pour in the stock. Cook for 8-10 mins until the liquid has reduced and the orzo is tender – add a few tablespoons of water if it begins to dry out. Scatter in three-quarters of the parsley and stir this through before serving in bowls topped with the remaining parsley and a grating of parmesan, if you like.