1. Put the garlic, chilli and tomatoes in a food processor and whizz until completely smooth.
2. Pour the tomato mixture into a large saucepan, add the vegetable stock, salt and pepper and bring up to a fast simmer.
3. Add the orzo and simmer for 15-20 minutes until the orzo is cooked through, stirring regularly to ensure that it doesn't stick to the bottom of the pan..
4. Serve with basil leaves, a scattering of grated cheese and a few grinds of black pepper.
