I heat the oil (plus a little from chorizo when it renders) in my large pan over medium heat. Then I cook the chorizo slices until they’re crisp and have brown edges. Once browned, I remove them and set aside so their oil flavour stays behind.
In the same pan with the leftover oil, I add diced onion, crushed garlic, oregano, paprika, cumin, salt, pepper—and optional chilli if using. I stir until they give off flavour (1-2 minutes). Then I mix in the rice, stirring so it becomes coated and a bit translucent around edges—that helps with flavour and texture.
Then I add diced capsicum, frozen peas and corn, tomato paste, and pour in chicken stock. Bring to a simmer, cover with lid, lower heat, and let it cook for about 10-15 minutes. I check occasionally to ensure it’s not drying out; if needed, I add a little more stock.
When rice is almost cooked, I return the chorizo to the pan, stir to combine, then cover and turn off heat. Let it rest (covered) for around 5 minutes—this finishing rest helps the rice absorb remaining moisture. Finally I taste and adjust salt, pepper, then serve.