Step 1: Boil the spaghetti until it's al dente, then reserve 1 cup of pasta water before draining.
Step 2: In a skillet, sauté olives, garlic, and lemon zest until fragrant.
Step 3: Add gin and cook until reduced by half.
Step 4: Stir in cream, olive brine, pasta, and reserved pasta water. Cook until the pasta is coated and the sauce is creamy.
Step 5: Finish by adding Parmesan, parsley, and butter until melted. Season with salt and serve with extra Parmesan on top.