Pour the peas and orzo into a pan with boiling water and cook for 10-12 minutes (or according to your packet).
Make the pesto while the pasta cooks: add all of the ingredients to a small food processor and blend until smooth/desired texture.
Drain and rinse, then stir through pesto and serve.
Store leftovers in the fridge for up to 3 days or freeze for up to one month.