Throw the spaghetti in a boiled water and add salt, stir to prevent the pasta from sticking together. Tipically it should be cook within 7 to 11 minutes then drain the pasta as quick as possible an reserve it on a plate. Heat oil and throw in a chopped onion, crushed tomato, green pepper. After waiting for a couple of minutes take your pasta and throw in the pot, stir it smootly then you serve