Steps:

• In a 6-qt. stockpot, cook fettuccine according to package directions. Drain; return to pot., Meanwhile, in a large skillet, heat butter over medium heat. Add onions; cook and stir 8-10 minutes or until tender. Add garlic; cook 1 minute longer. Stir in flour, salt and pepper until blended; gradually stir in cream. Bring to a boil, stirring constantly; cook and stir 2-4 minutes or until thickened., Stir in shrimp, lemon zest and lemon juice; cook 3-4 minutes or until shrimp turn pink. Stir in cheese and parsley. Add to fettuccine; toss to combine.

Steps:

• Sprinkle chicken with 1/4 teaspoon salt and 1/8 teaspoon pepper. In a large skillet, cook chicken in oil over medium heat until a thermometer registers 165°, 8-10 minutes turning once. Remove and let stand at least 5 minutes. Meanwhile, cook fettuccine according to package directions., In the same skillet, melt butter over medium-low heat. Stir in cream, 1/2 cup Parmesan cheese, Romano cheese, nutmeg and remaining salt and pepper. In a small bowl, whisk egg yolks; stir in a small amount of hot cream mixture into egg yolks. Return all to the pan, stirring constantly. Cook and stir over medium-low heat until a thermometer reads 160° and has thickened slightly. , Drain fettuccine; serve with Alfredo sauce, sliced chicken and remaining 1/4 cup Parmesan cheese. Garnish with fresh minced parsley.