Meanwhile, if you are using fresh chilis, roast them under 500 degree broiler for 10 minutes, turning once during cooking. When chilis are roasted, place them immediately into a plastic bag for about 15 minutes. After 15 minutes, remove chilis from plastice bag, peel off the skin, seed and chop the chilis. Be sure to wash your hands immediately after this step. Touching the skin after handling chilis can really burn.