If you are using fresh red peppers, cut them in half lengthways and remove the seeds and core. Place on a lined baking tray, drizzle with a little olive oil an place in an oven - preheated to 200°C/ 390°F - for 20 to 25 minutes. Remove from oven and allow to cool.Place all the ingredients into a food processor or blender with 2 cups of water and blitz until a thick and creamy sauce constancy is reached.Can be stored in the refrigerator for up to a week or 3 months in the freezer.