Boil water and add whatever variety of pasta* you prefer. Cook according to package directions. When al dente, save 1 cup of water. Set aside. Drain the rest of the pasta.
Add cubes of Boursin cheese, lemon juice, peas, salt, and pepper. Mix until cheese is melted. Slowly add reserved pasta water until it reaches your preferred saucy consistency.
Serve immediately with lemon garnish, zest or fresh parsley (optional).
Notes
*Note on serving size: This pasta serves 2-4 people, depending on whether you are making this as the main dish or a side. If you're making this as a main dish, consider doubling the recipe, as one Boursin cheese is too little for a whole box (1 lb.) of pasta. Save the pasta water. Don't forget to save the pasta water before draining! This is the key to getting the creamy, dreamy consistency you want, but it's so easy to forget!