Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente.

Reserve 1 cup of pasta water, then drain the pasta in a colander.

In a skillet over medium heat, melt the butter. Add the minced garlic and sauté for about 1 minute until fragrant.

Stir in the lemon juice and zest, then add the cooked pasta to the skillet.

Toss the pasta in the sauce, adding reserved pasta water as needed to create a creamy consistency.

Stir in the grated parmesan cheese, black pepper, and salt. Mix well until the cheese is melted and the pasta is well coated.

Serve immediately, garnished with chopped parsley.