For preparing roasted peppers, first roast the red peppers, green peppers and green chillies directly over the flame of a gas burner or gas grill.(before roasting, apply olive oil on the peppers and roast using metal tongs).
Keep rotating the pepper as the outer skin closest to heat, blisters and blackens.
Remove the peppers and green chillies when it has blackened completely.
Place the charred peppers and chillies in a plastic food bag and allow it to stand for 10 minutes until cold enough to handle.
Discard the outer blackened skin and remove the seeds and stem.
Cut the peppers and chillies into thick slices and keep aside.
Heat 1 tbsp of olive oil in a pan and fry the onions until the onions are golden in color.