This is comfort food at its finest — silky, glossy strands of spaghetti tangled with crisp, golden cubes of guanciale and a rich, savory sauce built from eggs and yolks whisked with nutritional yeast for that deep, cheesy backbone. The classic technique stays intact: pasta water loosens the sauce until it clings to every strand without ever scrambling, and a quick temperature check ensures it's silky and food-safe before it hits the bowl. A finishing shower of fresh parsley and a crack of black pepper keep things bright against all that richness. It's the kind of dish that feels indulgent but comes together in the time it takes to boil water, making it an easy weeknight win. And because the sauce here skips traditional cheese entirely in favor of nutritional yeast for that umami depth, this version is a genuinely solid pick for anyone eating lactose free. One bite and you'll understand why carbonara has stayed a classic for generations.
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Bring a large pot of water to a boil and add the kosher salt. Cook the spaghetti according to package directions until al dente — tender with a slight resistance at the center. Before draining, scoop out at least 1 1/2 cups of pasta cooking water and set it aside. Drain the pasta.
While the pasta cooks, place the guanciale in a cold 12-inch skillet and set it over medium heat. Cook, stirring occasionally, until the fat has rendered and the pieces are golden and crisp at the edges, about 8–10 minutes. Remove the skillet from the heat and let it cool for 2 minutes — the residual fat in the pan must not be screaming hot when the egg mixture is added.
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