Warm the olive oil in a large deep frying pan, add the onions, garlic and oregano and cook gently until translucent.
With a potato peeler, remove the skin from the red peppers and cut into 1cm (½ inch) cubes. Add the peppers and chillies to the onions and continue to cook for a further 6-8 minutes.
With the point of a knife, remove the eyes from the tomato