Because this recipe uses so few ingredients, it's very important not to make omissions or substitutions. Don't forget to salt the water used to boil your pasta. This adds a significant amount of flavor to the dish. Use medium sized garlic cloves and don't skimp on the quantity. The flavor of garlic mellows as it cooks, so don't be concerned that it will turn out too garlicky or harsh. Top your spaghetti with some freshly grated parmesan cheese for a little extra flavor if desired. Use a high quality olive oil for best flavor.