Add the fettuccine to a pot of boiling water and cook for 11 minutes or until al dente.
While pasta cooks, heat olive oil over medium-high heat in a skillet.
Stir in garlic and cook for 1 minute.
Add the shrimp, red pepper flakes, lemon juice, olive juice and 3 tablespoons butter and parsley.
Cook for 1-2 more minutes on low heat until shrimp is heated through. Remove from heat.
Drain fettuccine, return to pan and stir in the last tablespoon of butter.
Transfer fettuccine to skillet with shrimp and sauce. Mix together. Salt to taste.
Garnish with extra parsley and serve immediately.
Notes
Perfect Pasta: Cook the fettuccine just until al dente, according to the package instructions. Overcooking can lead to mushy pasta, so keep an eye on it while it cooks and test for doneness a minute or two before the suggested time.
Balancing Flavors: Adjust the seasoning to your taste preferences. Taste the dish before serving, and add salt as needed. Additionally, if you prefer a more intense lemon flavor, you can add a bit more lemon juice, but be cautious not to overpower the dish.
Freshness Matters: For the best flavor, use fresh parsley and garlic. Fresh herbs and aromatics can significantly elevate the taste of the dish. If possible, opt for fresh shrimp as well, as they will impart a sweeter and more delicate flavor compared to frozen shrimp.