Combine garbonzo beans, onions and vinegar in a bowl. Set aside. Preheat broiler. Combine bell peppers, tomatoes, 3/4 c basil and garlic in another bowl. Spread mixture evenly over heavy large baking sheet (spread with pam type substance). Broil until peppers soften slightly, stirring occasionally ~10 minutes. Add to garbanzo beans. Meanwhile, cook pasta, when done, add to bowl of all the other stuff, toss well. Sprinkly with remaining 1/4 cup basil if desired.