- Clean the peppers: open them, remove the seeds, and cut them into long strips. Then slice the onion.
- Heat the olive oil in a frying pan, add the onion and let it soften over a low heat for 10 minutes.
- Add the peppers and the whole garlic clove and cook with the lid on for about 15 minutes.
- Remove the garlic clove and add the tomato puree. Still with the lid on, cook for a further 15 minutes and season with salt/pepper.