To rehydrate the Tsp, place the Tsp in a medium bowl and pour the boiling water over it; set aside. Cook the macaroni according to the package directions.
In a large skillet, heat the oil over low heat. Add the onion and saute until tender. Add the Tsp and stir-fry for about 3 minutes. Add the cooked macaroni, the tomatoes, and the tomato sauce to the skillet; cover and heat everything thoroughly. Serve hot.
