No added cream.
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Bring a large pot of salted water to a boil. Cook 400 g spaghetti until al dente, about 10 minutes. Reserve some of the starchy pasta water before draining.
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While the water boils, toast black pepper in a skillet for 2 minutes and set aside.
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Cut 200 g guanciale into lardons and cook in a cold skillet over medium heat until the fat renders and the meat is crispy, about 8 minutes. Remove from heat.
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In a bowl, whisk together 1 egg and 4 egg yolks and 80 g pecorino romano (finely grated).
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Add the drained pasta to the skillet with the guanciale. Turn off the heat and pour in the egg mixture and toss rapidly, adding pasta water a splash at a time until the sauce is glossy and coats every strand.
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Crush the black pepper grounds and season generously. Serve immediately.