Brown the butter perfectly - stir often over medium-low heat until the butter turns golden brown, forms those little toasty brown bits at the bottom, and smells nutty
Save that pasta water, it is liquid gold. You should incrementally pour more into the pan after the pasta has been added in order to reach your desired consistency.
Add a motherload of FRESHLY grated parmesan both to the sauce and onto each plate. Please do not use pre-grated parmesan
