Fill a large pot with at least 7 quarts of water, bring to a boil over high heat..
Once it is boiling, add a small handful of salt, and then add the pasta. Cook according to the manufacturer's directions. Cook until the pasta is “al dente” (it will still have a bite to it, not mushy).
Ladle 1 1/2 cups of pasta water into a measuring cup and then drain your pasta.
It will stick together; you will be tempted to olive oil but don’t. The next step is where the magic happens
In a large (10-12-inch) skillet, over low heat, add your butter and the pasta water. Let it cook until the butter is melted, about 3 minutes.
Add fresh ground pepper, stir the sauce.
Add the cheese and stir, you will have a very liquidy cheese sauce.
Add approximately ¼ of the pasta to the skillet, mix until pasta is coated. Because you did not add oil or butter to the pasta, this butter/pepper mixture will absorb into the pasta.
Continue adding the pasta in increments and always mix so all spaghetti is coated before adding more.
*NOTE* For this step I like to use kitchen tongs. Makes it easier to mix.
Serve and enjoy!
Notes
You may want to sprinkle some fresh pepper or more Parmigiano cheese on top. This step is optional.