Do I have to use fettuccine?
Nope. Fettuccine is classic because the wide noodles hold sauce well, but linguine, tagliatelle, or even penne work great. Just save that pasta water either way.
How do I know when shrimp are done?
They turn pink and opaque and curl into a loose “C” shape. If they curl into a tight “O,” they are likely overcooked (not a perfect test, but a helpful cue). If you like numbers, aim for about 125 to 130°F in the thickest part for tender shrimp, and up to 145°F for fully firm and done.
Why did my Alfredo sauce get grainy?
Common causes are heat that is too high, adding cheese while the sauce is actively boiling, or using pre-shredded Parmesan (anti-caking agents can make it gritty). It can also happen with low-quality or very aged Parmesan. Keep the heat low, add the cheese gradually, and use freshly grated Parmesan for the smoothest sauce.
Can I use half-and-half instead of heavy cream?
You can, but the sauce will be thinner and more likely to break if boiled. Keep it at a gentle simmer, and lean on pasta water and Parmesan to help it thicken.
Can I make it a little lighter?
Yes. Use a bit less butter, swap in half-and-half, and add extra lemon and parsley for lift. It will still be creamy, just not as plush.
My sauce is too thick or too thin. Help.
Too thick: add a splash of hot reserved pasta water (or a little warm cream) and toss until silky again. Too thin: let the cream simmer for another minute or two before adding Parmesan, or off heat whisk in a little more finely grated Parmesan until it coats the pasta.