Pasta Salad without buttermilk scallions

500 g pasta , e.g. Penne, Farfalle 4 -6 tomatoes , preferably Roma 1 large cucumber 2 -3 red bell peppers or 2 -3 yellow bell peppers 200 g canned corn 200 g[...]

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[...]