01 - Bring a large pot of salted water to a boil. Add fettuccine and cook until al dente according to package instructions. Reserve 1/2 cup pasta water, then drain.
02 - Melt butter in a large skillet over medium heat. Add minced garlic and sauté until fragrant, about 1 minute.
03 - Pour in heavy cream and bring to a gentle simmer. Stir frequently and cook for 2 to 3 minutes until slightly thickened.
04 - Reduce heat to low. Stir in Parmesan cheese, sea salt, black pepper, and nutmeg until the cheese melts and sauce is smooth.
05 - Add drained fettuccine to the skillet, tossing to coat thoroughly. Add reserved pasta water gradually as needed to reach desired sauce consistency.
06 - Plate immediately and garnish with chopped parsley and additional Parmesan if desired.