Heat 1 tablespoon of the oil in large flameproof baking dish; cook zucchini, stirring, until browned. Remove from pan. Heat another tablespoon of the oil in dish; cook eggplant, stirring, until browned.
Remove from pan. Repeat with another tablespoon of the oil and capsicum. Remove from pan.
Heat remaining 2 tablespoons of oil in large flameproof casserole dish; cook onion and garlic, stirring, until onion is soft. Add crushed tomatoes; bring to the boil.
Reduce heat, simmer, uncovered, until thickened to a sauce consistency.
Add vegetables to dish with chilli, rind, seeds, bay leaves and basil. Simmer, covered, about 40 minutes or until vegetables are tender and mixture thickens. Stir in vinegar; remove bay leaves and rind.