6tbspbuttersalted or unsalted - whatever you have on hand
1/2cupreserved pasta cooking water
2tbsplemon juice
1/2cupParmesan cheesegrated
1clove garlicminced
1tbspred pepper flakesoptional
Instructions
Fill a large stock pot about 3/4 full with cold water and add the salt. Bring the water to a boil over high heat. Add the spaghetti and cook according to package directions (usually 10 - 12 minutes).
Reserve about 1/2 cup of the pasta water and drain the rest. Place the cooked and drained spaghetti back into the pot over low heat.
Add the butter, lemon juice and garlic. Add the reserved pasta water a little at a time and stir the cooked pasta until the butter is melted and the pasta looks sauced. You may not need the full 1/2 cup of the reserved water. Turn the heat off.
Toss in the Parmesan cheese and red pepper flakes with the pasta. Serve immediately.