In a large pot of salted boiling water, cook the pasta according to the package instructions or until al dente. Before draining, reserve about 1/2 cup of pasta water and set aside.

While the pasta is cooking, melt butter in a large skillet over medium heat. Once melted, reduce heat to low and add in the Boursin cheese. Break up the cheese as it melts using a spatula. Stir in the heavy cream (or half-and-half), continuously stirring until you get a smooth sauce.

Incorporate the lemon zest and juice into the sauce. Mix well.

Add the drained pasta to the skillet with the Boursin lemon sauce. Toss well to ensure each strand of pasta is coated with the sauce. If the sauce seems too thick, add in the reserved pasta water a little at a time until desired consistency is reached.

Season with salt and freshly ground black pepper to taste. If you like a hint of heat, sprinkle in some crushed red pepper flakes.

Transfer the pasta to serving dishes. Garnish with freshly chopped parsley and optionally, some grated Parmesan cheese on top. Serve immediately and enjoy your homemade, delicious lemon boursin pasta recipe.