Cheese Tortellini with Vegetables

1 (9 ounce) package buitoni three cheese tortellini, cooked,drained and kept warm 2 tablespoons butter or 2 tablespoons margarine 1 medium zucchini , unpeeled[...]

9 ounces cheese tortellini, frozen 1 teaspoon extra virgin olive oil 1 large red onion , sliced 1 large red pepper, sliced 2 tablespoons sun-dried tomatoes ,[...]