Begin by bringing a large pot of salted water to a vigorous boil. Once boiling, add the tagliatelle pasta and cook according to the package instructions until it reaches an al dente texture. Before draining, reserve about 1 cup of the pasta cooking water, then drain the pasta and set it aside.
In a large skillet, combine the olive oil and butter, heating over medium heat. Once the butter is melted, add the minced garlic. Sauté for about 1-2 minutes, stirring frequently until the garlic is fragrant and lightly golden. Be cautious not to let it burn, as it can turn bitter.
Lower the heat to medium-low and slowly pour the heavy cream into the skillet. Stir continuously for about 3-4 minutes, or until the cream starts to thicken slightly.
Gradually incorporate the finely grated Parmesan cheese into the creamy mixture, stirring until it melts completely and becomes smoothly integrated. If the sauce feels too thick, add small amounts of the reserved pasta water until you achieve the desired creamy consistency.
Season your rich sauce with sea salt, freshly ground black pepper, lemon zest, and red pepper flakes (if you’re using them) for a touch of heat. Adjust the seasonings to your liking.
Gently add the drained tagliatelle into the skillet, using tongs or a spatula to toss the pasta until each strand is well-coated in the creamy garlic sauce.
Allow the mixture to cook for an additional 1-2 minutes on low heat. This step helps the flavors meld beautifully together.
Serve the creamy tagliatelle immediately, garnishing each plate with a sprinkle of freshly chopped parsley and extra grated Parmesan cheese if you desire.
Notes
For an elegant presentation, twirl the tagliatelle onto plates using a fork before serving, and add a lemon wedge for an extra pop of color and a hint of freshness.