Cook the tortellini according to the package directions. drain, and keep warm. Meanwhile, place the roasted sweet potatoes in a food processor bowl or blender container. Cover and process or blend until smooth. Set aside. For the sauce: In a medium saucepan cook the onion and garlic in butter or margarine until tender. Add the pureed roasted peppers, thyme, oregano and sugar. Cook and stir until heated through. Pour the sauce over the tortellini. Toss to coat. Makes 3 servings