Easy One Pot Lemon Pasta

Name: Easy One Pot Lemon Pasta
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Cuisine: American, Italian
Ingredients: 1 stick salted Danish creamy butter; 1 pound cooked spaghetti; 2 cloves grated garlic; 1 teaspoon salt, more or less to taste; 1 teaspoon freshly ground black pepper; 1 1/2 cup reserved pasta water; 3 Tablespoons juice of a lemon + zest; 3/4 cup freshly grated parmesan cheese