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Bring a large pot of water to boil. Salt the water generously (the directions on The Kitchn say it should taste like ocean, which I thought was a great tip! Cook pasta until al dente. Strain pasta, reserving 1/2 cup of that salty pasta water.
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Heat a large skillet over medium heat. Cook the guanciale for a few minutes until crispy and delicious and remove from heat.
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Whisk up the eggs and cheese, but do not over mix.
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Put the pan of guanciale back on medium heat and add half of the pasta water. Toss in the spaghetti and shake pan until most of the water has evaporated.
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Take off the stove and add the egg-cheese mixture into the pan and stir quickly, very quickly — if you don't it will turn into a weird scrambled egg mixture. If the sauce seems too thick, add a little more pasta water to make it creamy and slick.
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Crack that pepper, lots of pepper. Salt to taste. (If you really made your water ocean-y, you probably won’t need to salt)
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Serve immediately and enjoy it right away. When it gets cold it's a big CarbonarNO.