Heat the oil in a pan and then add the garlic and the onion. Sauté until the onions are soft, then add the red chillies. Stir a couple of times and then add the tomatoes. Cook for a couple of minutes then add the red bell pepper, spring onions and the coriander. Cook for 2 minutes and take it off the heat. Add salt to taste, mix it in and let it cool a bit.