This is the real deal. Although Batali doesn't use any milk in his at all, I do cause I'm a rebel and I'll never ever be any good. (5 points if you get that song reference. that, and, you're old).
So anyhow, this is my recipe. I have a recipe for Alfredo that takes a little bit more time, and is a little bit more like what you typically think about when you dream alfredo (a little saucier), but I actually prefer this one. So.
During this process, you should be cooking your pasta in water as salty as the sea. And do NOT put olive oil in this water. Your pasta will not soak up any of the delicious sauce, it will just slide right off and that's just stupid. Do not fully cook your pasta. Subtract about 4 minutes off of it's cook time.
Add some of the salty, starchy water to your pan. I used about a ladle and a half. Then add your undercooked pasta.
Then this happens. You're welcome.