Bring a large pot of salted water to a boil and cook tagliatelle according to package instructions. Drain and set aside.
Meanwhile, heat olive oil in a skillet over medium heat. Add garlic and cook until fragrant, about 1 minute.
Pour in the white wine and let it simmer for 2–3 minutes to reduce slightly.
Stir in the heavy cream and let the sauce simmer for another 5 minutes until it begins to thicken.
Add the smoked salmon and lemon zest. Stir to combine and cook for 2–3 minutes.
Season with salt and black pepper.
Add the cooked tagliatelle to the sauce and toss until fully coated.
Serve immediately, garnished with fresh parsley.