01 - Bring a large pot of salted water to a boil. Cook fettuccine until al dente, reserving 1/2 cup pasta water before draining.
02 - Pat salmon fillets dry and season both sides generously with salt and black pepper.
03 - Heat olive oil in a large skillet over medium-high heat. Sear salmon for 3-4 minutes per side until golden and just cooked through. Transfer to a plate and cover with foil.
04 - Reduce heat to medium. Melt butter in the same skillet, add shallot, and sauté for 1 minute. Add garlic and cook until fragrant, about 30 seconds.
05 - Pour in white wine and simmer for 1-2 minutes, scraping up browned bits from the bottom of the pan.
06 - Stir in heavy cream, lemon zest, and lemon juice. Simmer gently for 2-3 minutes until slightly thickened. Whisk in Parmesan until smooth. Season to taste.
07 - Flake salmon into large chunks. Add drained pasta and salmon to the skillet, tossing to coat. Add reserved pasta water as needed for consistency. Garnish with parsley and serve immediately.