5. when thick, season with salt and pepper to taste. keep warm in bain marie for service.
6. cook spaghetti in boiling salted water with oil till 'al dente' use a large pot so that there is room for the spaghetti to move.
7. when cooked, drain and refreshnis cold running water to stop cooking process. set aside for service.
8. reheat spaghetti in hot salted water with oil. drain and toss in alfredo sauce.
9. garnish with chopped parsley and parmesan cheese.