Preheat broiler. Cut bell peppers in half lengthwise; discard seeds and membranes. Place pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Place eggplant halves, skin sides up, on baking sheet. Broil peppers and eggplant 15 minutes or until blackened. Place peppers in a zip-top plastic bag; seal. Let stand 10 minutes. Peel peppers. Scoop out eggplant pulp. Discard shells.
Combine 1 cup broth and onion in a medium saucepan; bring to a boil. Reduce heat; simmer 5 minutes. Add 2 cups broth, bell peppers, and eggplant pulp, and simmer 10 minutes. Place bell pepper mixture in a blender; process until smooth. Return pureed mixture to pan. Stir in basil, salt, and black pepper. Garnish with cilantro sprigs, if desired.
another great vintage recipe from cooking light. fantastic fusion of roasted flavors.