This sauce is also good with the Baked Beef Empanadas.
1. Prepare broiler.
2. Cut bell pepper in half lengthwise, discarding seeds and membranes. Place pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Broil 15 minutes or until blackened. Place in a paper bag; fold to close tightly. Let stand 10 minutes. Peel and coarsely chop. Place bell pepper and remaining ingredients in a blender, and process until smooth.