Add the onion, garlic, lemon juice, lemon zest, and wine to the pot. Stir for 5 minutes.
½ cup white onion, 3 garlic cloves, ½ lemon zested and juiced, ⅓ cup white cooking wine
Add 2 teaspoons of flour and stir for 2 to 3 minutes to make sure the flour is cooked.
2 teaspoons all-purpose flour
To the pot, add the whipping cream, Parmesan cheese, Italian seasoning, salt, and pepper.
1 cup heavy whipping cream, 1 ½ cup shredded parmesan cheese, ½ teaspoon Italian seasoning, ¾ teaspoon coarse kosher salt, ½ teaspoon ground black pepper
Stir for 5 minutes or until you have the thickness you like.
Add the cooked pasta. Toss until combined.
Add the shrimp and cook for an additional 5 to 7 minutes or until the shrimp turn pink and opaque. Make sure not to cook it too long, as the shrimp will become rubbery.
1 pound raw shrimp
Add the reserved pasta water, 2 tablespoons at a time, until you reach the smooth consistency you desire.
¼ cup pasta water reserved
Transfer the pasta to your serving dish and top with parsley.
1 Tablespoon parsley
Serve immediately.
Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.
To reheat, warm the pasta gently in a skillet over low heat with a splash of cream, milk, or water to loosen the sauce. Microwaving works too, though lower heat helps prevent the shrimp from becoming rubbery.
Freezing is not ideal for cream sauces since they can separate once thawed. If needed, freeze in portions for up to 1 month and reheat slowly while stirring well.
To make ahead, the sauce can be made a few hours in advance and gently reheated before adding freshly cooked shrimp and pasta.