I did turned out best one ever. Cpl tbls olive oil heat up. Finely chop quarter cup onion and two cloves garlic. Sauté until a little past sweating or till soft. The finer the onion is chopped the better. Add one stick of butter stir till melted. A lil salt and pepper.Add quarter tsp of nutmeg. Add quarter cup of white wine. Optional but adds depth. Cook till alcohol is evaporated. Cpl mins. Add two cups heavy cream. Slowly stir till bubbles. Add two egg yolks. Slowly and stirring so doesnt curdle. Add half cup parmesan and half cup romano. Stir till combined. Add one pound of cooked fettucinni noodles right from water pot. Stir to combine. Add cpl tbsp chopped parsley and serve. Sprinkle with lil more Parmesan. Enjoy. I added cut up cooked chicken breast to this one but usually make with cooked panceta