Pasta Salad With Roasted Vegetables with onion

1 lb small shell pasta , cooked,rinsed with cold water and set aside 1 1/2 cups fennel bulbs , cut in half lengthwise 1 large sweet onion , sliced 1/2 inch[...]

8 plum tomatoes , halved and seeded 1 small green pepper , quartered, ribs and seeds removed 1 cup dried macaroni or 1 cup other pastas 3/4 cup finely chopped[...]